Zayres, now that's a name I've not heard in a long time, a long time.I remember they changed their name or sold out to a store named Ames.
When I first started buy kits on my own, they where in $8 range in the early 90's at the toy store in the malls, Wal-Mart, hobby stores, and a store I can't remember the name of that had a great selection of models.