We're just talking about swaps. If you want to use walmart fabric for your own stuff go right ahead. But when you're swapping with people that pay full retail price and buy top quality fabric do you really think it's fair to send in dollar a yard fabric from walmart? *I* find that offensive.
Since there are at least a couple of dozen places that regularly sell quilt shop fabrics below 4 bucks a yard the majority of people can afford a yard or two of good quality fabrics for a swap. If you can't afford good quality fabric and the postage for a swap then maybe you shouldn't be swapping if your budget is that tight. I know if my budget was that tight I wouldn't be swapping. Been there, done that. And since I've been there and done that, I know it's possible to afford good quality fabric if you really want to.
Unless you live in my area, I don't know how you would know who sells what for which price so we'll just have to agree to disagree.