It is in Keller off 170 and Alta Vista.
Phil in my opinion Overton's has by far some of the best quality fish. My first year I bought some Tilapia from another source and then bought more from Overton's and there was a huge difference in quality and survival rates.
Overton's actually raise most of their fish themselves and
don't buy the majority of their fish from others then re-sell them to you.
Overton's is in Buffalo, Texas. Todd Overton is a PondBoss member, has a degree in Wildlife and Fisheries Science and even hosted a Picnic for NE Texas PondBoss customers last Fall. The guy that delivers my fish is Clint, who is also a fisheries biologist with a degree in Wildlife and Fisheries Management.
Several Dallas area PondBoss members drive down there about once a year to pickup their fish, and it's neat seeing the operation. Or Overton's will bring the fish to you. They deliver to Oklahoma and Louisiana so I know they would bring fish to Keller. There is a mileage fee for fish delivery, but that's true with most fish sellers.