meh... I wouldn't worry about the shipping supplies already. There's no telling how many fry you will have to sell until they are about 1 month old - then, you have a pretty certain idea of the number, as you can lose lots of fry in the first 4 weeks.
For the spawn tank, you need a 10 gallon+ tub/tank, a 100w heater, a sponge filter or Penn Plax corner filter (these are the best, and they're sold at almost any pet or aquarium store), lots of bushy plants, just as basics. For the grow-out, you will need at least one 20+ gallon tub, a heater that correlates to the tank size, a power filter (for when the fry are 1 inch+), plenty of plants, loads of fry food AND back-up fry food, and loads of cleaning supplies. Here's some products I recommend to have on-hand, for the grow-out stages and even before then.
Hikari First Bites - my Bettas still love to graze on this, at 9 weeks. I had pretty good success at feeding this to 3 week-olds when my Microworm and BBS supply was low.
Microworm Culture - soooo easy. All you need is a jar with an inch of oatmeal in it, and a lid. Throw the culture in there, and it should be active within a week. MW's can be fed to newborns as a staple diet, and for older fry as a snack.
BBS Hatchery - don't buy a hatchery. A home-made hatchery works exactly the same. Get a 1-litre soda bottle, cut off the top, stick an airline in there connected to a pump and you have a $5 (or less) hatchery. You will also need aquarium salt and baking soda to treat the water, but you probably already have that on hand!
Basically every type of syphoning device out there!... get a big bundle of airline tubing for syphoning (costs $1), a small gravel vaccum, larger airline tubing, filter floss (to stuff into one end of the gravel vaccum... so fry don't get sucked up), a couple turkey basters, an eye dropper, and plenty of buckets or a large tub to age water in.
Get 2 LARGE bottles of Novaqua and Amquel. You will need them
! Doing 50+% water changes every day requires tons of treated, aged water.
Penn Plax corner filter, as I said before, is an awesome filter for the spawning tank. Equally awesome is the carbon/sponge "Small World" filter that is available at Petsmart and Petco. For grow-outs, I HIGHLY recommend a Penguin Mini Bio-Wheel filter. This really makes the water sparkly clean and totally cuts down your syphoning duties. You'll still need to do lots of water changes, but Penguin filters rock it!
Atison's Pro Betta food is a good continuation of the Starter food. I feed it to my 9 week-olds with good results... however, the granules are pretty much too big for fry that are under 2 months old. If you want a dry food for your fry between 4-8 weeks, I recommend Betta Bites because they're much smaller.
http
/www.petdiscounters.com is the best! They sell all of the Atison products, along with Penguin Bio-wheel filters, at super good prices. I ordered lots of Atison's food, plus the Atison's water treatment stuff, plus a Penguin 100 Bio-Wheel Power Filter, and 3 other fish foods, all for $35 including shipping. I ordered it on a Saturday and it arrived Monday morning. It's definitely a great quality store... my Penguin filter cost about $15 from there, when it is over $30 at Petsmart.
Good luck getting ready for your spawn
and be prepared to be broke.
Edit: to answer your question about Microworms, you can get a culture for just the cost of shipping from any of the breeders on this board, basically. Wuv has offered to send you a culture, and I could too!
PLEAAASE check the sticky thread about fry food. It explains Baby Brine Shrimp... All you need to hatch them is the 1 litre set-up I explained, water treated with 1 tbsp of salt per litre and 1/4 tbsp baking soda per litre, and lots of water current so you will need to hook up and airstone to a small air pump. Just add 1 tbsp of BBS eggs (they're actually cysts, you can buy them in jars at Petsmart) and within 24-48 hours, a percentage of the eggs will have hatched. Then, you will need to disconnect the air pump and shine a flashlight towards the bottom of the bottle... BBS are attracted to light, so the tiny shrimp will swim toward it. Using a turkey baster, suck out the BBS and drain out the salt water by putting it through a fine Brine Shrimp net. Rinse the net into a small cup of tank water and, using an eye dropper or a turkey baster, remove controlled numbers of the BBS. The ratio is about 3-4 BBS per fry, and you should avoid over-feeding at all costs. Do NOT continue to feed your fry until they look like their tummies are about to explode, or it could result in swim bladder issues.
. Microworms and Vinegar Eels are the best food for fry in there early week from week 1 to around week 3 then u start giving them BBS. After they hit there juvenile age Start feeding grindal worms and chopped up blackworms! 
