You know, concerning bows, they grow slowly, especially bosemani. But if you are willing to wait a bit for them to grow you should be able to get just about any bow for $4-$6 from a breeder.
I got 25 bows for a total of 120.00, each about 1.5" or so. Even at that size they have some nice colors and those colors have just been improving each week.
And I know there are plenty of rainbow fish peoples on the rainbowfish forum from New York.
One thing to consider is that since they are such aggressive eaters they would not mix well with passive fish.
20L My Other Tank: OEBT Shrimp
40B Inlaws Tank: 2 goldfish
75 Main Tank w/ sump: 5 Glossolepis pseudoincisus, 5 Melanotaenia boesemani, 10 Melanotaenia praecox, 5 Melanotaenia lacustris, some cories, a bn pleco and rainbow fish fry