that is oophaga pumilio 'bastimentos' (thats a guess at locale, but i'd say a pretty good one. it could be cemetery or red frog beach)
not a suggested beginner frog (however it is commonly suggested as a first pumilio)
i would personally try and get some mantella aurantiaca. they are red, cheap, and cn live in dense groups. they sound like the best option IMO.
galacts are expensive (if you can find them) at about $125 (seems average from what ive seen)
tricolors/ anthonyi are small fast frogs, they are reasonably priced at between $40-$100 but they are small and do not handle the beginner mistakes like a larger frog would. they do well in pairs or trios
pumilio are small, expensive (from $70-200) and along with their small size belong to a group known as obligate egg feeders, meaning that offspring can be difficult to raise to adulthood. most are also WC frogs that have WC problems. this makes them a bad choice. these are also only suited to pairs or trios.
mantellas can be hard to find, but aurantiaca have recently flooded the marked and can be had for $25-60. you could probably even find someone with tadpoles which i would imagine could be bought for about $10 each. they are larger frogs (than the pums or tricolors), and they do well in groups. they can be temperature sensitive though.
james