There used to be a store or two around here that sold whatever was left after other stores burned down, and had other odds and ends. They may have had other stores' customer returns too. The only thing I remember buying was 12"x12" linoleum, not vinyl, floor tiles. If you ever want your floor done and ask to see linoleum, the salesman will likely say something like, "Sure, I have some vinyl sheeting right over here to show you." I found enough to do the bathroom floor of the mobile home I lived in for a few years, after I replaced a spongy piece of floor around the floor duct. I used self-adhesive vinyl tiles to shim the surface of the plywood up to the height of the original floor.
I read a bit about laying floor tiles before I started, made all my measurements and drew my center lines of the floor to get everything lined up. When my measurements said I would end up with 3-4" wide tiles on both sides, I drew another line 6" off center to start from, and ended up with 8-9" tiles on the sides instead. I alternated the grain of the tiles as I placed them in the adhesive I troweled on. When I got done everything matched from side to side and end for end, with no half tiles or smaller. All except where the floor made an ell where the toilet sat next to the end of the bathtub. Not many people would look at the floor behind the toilet anyway, and the rest of the floor looked great. That was the only time I ever laid floor tiles and I'm very proud of the job I did. I should have taken pictures of it to show anyone who would look.