aquatic adventure usually has them, fish planet in deerfield will special order them for you. even petco will special oder but the will charge insane prices.
I have 11 of them welcome to dp land!
I would only keep 3 in 10 gallon, but thats me.
20L Daughter's Tank: 2 Bolivian Rams and Threadfin Rainbowfish
40B Inlaws Tank: 4 Bolivian Rams and Guppies
75 Main Tank w/ sump: 5 Glossolepis pseudoincisus, 5 Melanotaenia boesemani, 10 Melanotaenia praecox, 5 Melanotaenia lacustris