My mom says she can't find any in Dallas. I say she isn't looking in the right places. Where can the serious cook turn to when in Dallas for the relatively obscure?
Hiep Thai Market on Walnut at Jupiter (Northeast corner) has them -- you can get just the feet or the feet attached to the rest of the bird, head included.
The new Asian World Market in Plano on Legacy / 75 should have chicken feet. Customer service are much better and friendly than May Hua on Coit / Park.