In general, you'll struggle to find any Bradypodions being kept in captivity, particularly in North America. The reason for this is that Bradypodions are endemic to South Africa, and the South African wildlife authorities have placed very stiff restrictions on the trade of all indigenous reptiles.
You can't even keep bradypodion chameleons in South Africa legally, without obtaining permits that can be quite onorous to secure. They'll only allow chameleons to be exported from South Africa for scientific research these days.
Add to that the fact that many of the Bradypodion species are CITES listed as threatened or endangered - they're certainly not a species that will ever be commonly kept by herpetologists.
Chris Anderson said that there were populations of captive thamnobates
established in Europe, so count yourself very lucky that you have some of these. They will probably fetch very high prices if you manage to breed them successfully, since they are very rare.
You'd probably find the following articles quite interesting:
- AdCham Species Profile: Bradypodion thamnobates
(this article mentions that these dwarfs are particularly susceptible to respiratory infections)
- The Natal Midlands Dwarf Chameleon