If you are still looking to find rabbits for sale in east texas... I suggest that you locate an online rabbit breeders directory.
No it's not illegal to have a yard sale in texas.
Sales tax in Texas is 6.25%.
Texas has a constitutionally mandated maximum sales tax of 8.25%. Individual counties are allowed to set their sales tax rates wherever they like, but cannot exceed the 8.25% cap.
Try Craig's since it's free. Many people also sell them on Ebay. Navl will pick up from you & deliver to a buyer anywhere in the US.