I'm not surprised; what isn't going up and up in cost? Many corporations are making record profits.
Rarely do I buy fabric that's not on sale, same for notions. Quite a few years ago, there was a company in Canada that was going out of business; all of their Aurifil was sold at great price. The colors were a little odd by the time I found out about it, but I bought several spools of what I'd call a shade of peach. Pretty ugly, actually - but it works just fine for most piecing. It's also a lot less expensive if purchased by the cone, so if I want white or gray, that's what I'll do.