I just stumbled on a great source for vinyl:
Books & More
1626 W. University Dr.
Denton, Texas 76201
(940) 387-9022
I had found this place a couple of years ago by accident, but didn't pay attention to how I found it (I was just driving around in a new area). Well, I came upon it again and thought I'd share. Great selection of interesting (used) vinyl. For example, multiple linear feet of Beatles releases (various releases and conditions). The vinyl is sourced through Cliff West a.k.a Record Hound (recordhound2@charter.net). Pretty easy drive - exit 469 east (just north of the I-35 split).
I do not have any affiliation with Books & More or with Cliff.