Sorry, I was actually half wrong!
They have them divided by species, but they generally cost the same (but not always...). But, they do have big tanks that have assorted ones in there and then they are sold by size ($35 for med, $40 something for large...that's gone up in the past two months!!).
I ended up getting 4 new ones today, after loosing my crabo last night - I was gone for most of yesterday and I didn't think to look in on em when I got home (as their lights were already off) and this morning he was gone

. He was FINE last time I checked though...didn't have cuts like the other one but did have a weird white patch on him...I wonder if he got burnt on the heater or something? It was very weird. I didn't think to get a picture though, sorry.
I ended up with the cheapest they had there, since I'm just really poor right now, and it still cost me $50 for 4. i got 3 "Assorted" which are basically bland females, I think, and an "assorted" peacock, which looks just like them. Odd. I don't care what they look like as long as the aggression level goes down. So that makes 11 fish, 12 once the yellow(who is done her 4 days and looks awesome, a little more re-growth needed before she goes back, though) goes back.
There are over half teh fish (new and old) crowded together in the top corner of the tank. I take it this is a bad sign

Ugh I tried to educate myself before buying this fish, I swear...
If this doesn't work, I'm probably just going to either rehome the bully or put him in a separate tank by himself, which sucks but it's all I can do. He's already started bullying the new fish. I already know which fish is going to take over, though...the Johanni. But he's little, so I hope it'll be in vain.
I really hope they figure it out...