I mostly look at things and think, does that seem ok to me? I do have limits on what I'm willing to pay and some of them might seem sort of silly, like living here in Washington state, I'm not willing to spend much above a dollar a pound for apples, so I happily let the high end market consumers get the $3.99+ perfect large apples and I get the class 2 versions (off shaped, smaller, leaf marks) for my $1.19.
But I really don't like the model of "fake" prices where they don't expect anyone to buy. It's not only chain fabric stores, but basically all furniture and mattresses and many other things are artificially priced so they can always be on sale.
When you see those ads on tv and hear the "deep discounts and 50%" or more, know that they are still making money. Enough that they can afford those tv ads. Same thing with organizations/charities that can afford tv ads or sending you a "gift" or whatever....