Hi Paul, the only stores I ever saw arrangers in around here, were the Guitar Center near the ballpark in Arlington, Murphy's Music on 183 in Farmers Branch, and maybe Mr. E's music on SH 183 near the Bedford Rd. exit.
Honestly the last time I saw a good selection in ANY of those stores was probably 2007 before the economy tanked. The MOTL Yamahas are pretty common (and also very similar to previous models.) Anything else, you almost certainly have to mail order it, and take a chance on the restocking fee. Welcome to life in the modern age. At least we're saving gas money!