Welcome! I'm in Amarillo (well, just south) - there are FaceBook groups called "West Texas Chickens" and "Chickens and Stuff in the Texas Panhandle". You might ask to join those - people post chickens for sale there occasionally. Of course, you'd have to verify the quality of the seller's flock. Also people post chickens/pullets/chicks on Craigslist in Lubbock quite frequently. I check Craigslist every so often just to see what's up for sale.
Hope this helps!