James, you may go to the web site of ERAsells.com, and look at all the local listing in Amarillo, Tx. . I will let you know that mobile homes here do not hold there resale value very well, compared to a site built home. If I can be of futher service, just let me know.
Trulia shows several mobile/manufactured homes currently for sale in the Amarillo area at the link below. I recommend that you use the filters on the left side of the page to refine the list by the price and amenities best for you. Under those filters you'll also see the option to sign up for new listing alerts that match your selected criteria.