Usually the cues available at Walmart and general sporting goods stores are crap but it is good to be able to tell the crap from the Shinola, so a visit to the "really cheap and generally shoddy cues from China" section can be instructive.
And while there are some billiard supply stores that do good work, I have had two very bad experiences getting cues retipped at stores including one that involved a wild chisel applied to an original Balabushka ivory ferrule. As I recall, I didn't even get an apology for that one.