Floyd's isn't going to cost you but 10 dollars. You get to drive through some lovely wrecking yard scenery and past an old dump spot, that stunk to high heaven last time I was there, to find a heavily dug up area. There's still stuff in there though...
Chrisner's, you will pay 20 dollars to dig for 6 hours or 40 for 12. You only have to drive past one small wrecking yard, but the land is much much much prettier.
Floyd's is in Leander. It's about 5 miles from my house.
Chrisner's is out past Temple and quite a bit further.
I've only been to each place once. I like Chrisner's much more. I found a small end scraper and Floyd's and a nice hammerstone at Chrisner's.
And I've seen more pics of things that come off Chrisners.