Hey I will agree that looks a very pretty tank but how many litres or gallons is it? On here most recommend 3 -5 gallons being minimum to house a betta (there will always be disagreeances whether 3 or 5) if you can get a 5g this will be much much better. The betta will need a heater as they are tropical though depending on your area may not need on all year round (I live in pretty cool area so heaters always on). Filters are also recommended and to fully cycle as it is easier on the fish and easier on you as you won't have to do as many water changes as the filter will help keep the ammonia and waste down.
Right looking on google this is a half gallon tank and really is unsuitable. Before you ask why are they selling? Because people buy because the tanks look nice and if being sold must be ok for the fish, unfortunately the manufacturers don't care on correctness but sales which is truly sad for the poor bettas. A larger gallon tank will ensure a better healthier long lived life. The tank also from what can see does not come with heater or filter.
I would try Ebay you can type in tank and select fish on the left when results come up, then you can specify the results to within more local area (pick location button and type in area code and within however many miles willing to travel) Ive picked up good bargains here and for less than your tank
Also try craigs list as mentioned above, your local fish store (LFS) also will have sales from now and then and some do good cheap setups anyways.
Shopping List:
Gravel / Sand
Small heater 25w (can get good mini versions)
Small Filter (hang on back, mini elite, etc)
3-5g Tank
Silk or live plants (they are inquisitive)
Perhaps small place to call home
Ensure the tank has a lid as these are prone jumpers, they feed off betta pellets as main staple and bloodworm as treats, peas help clear them out. Unsure how much know or researched here is something typed up that may or may not help (it is how I and some members on here would say basic setup but there will always be differing opinions, I do hope it helps

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http
/www.fishforums.net/index.php?showtopic=298664&hl=
Hope that helps and not overloaded too badly just want best for your betta
