Yes...right there with you! It is one of the things that makes me REALLY mad, especially when I really need something to finish a project.
Years ago, I de-stashed my entire FQ collection of Paris Flea Market (3 Sisters)I, Bonnie & Camille Ruby Jelly Roll, 3 charm packs of Scrumptious, and Marmalade. I priced them at what I paid for them (in case someone really needed them), only to find them listed again at 4 times the price.
Last year I made three Christmas Quilts with 'Swell Christmas' by Urban Chiks (Potluck pattern from a Quilting Life, to which I added a row to even it out), and a Wintersweet quilt (free pattern) quilt with Figtree's Christmas Figs II. When I needed some addition yardage of the red Swell Christmas Santa Print, I had to pay $26 for 1/2 yard, and Christmas Figs II was priced so high that I purchased a complete 1/2 bundle of the Red and Green prints of Christmas Stitched.
This year I made four more of the 'Swell Christmas/Deer Christmas' Potluck quilts (very lg. family). Luckily, I found a gal who sold me 4 yards at $25/yd.; still priced higher but not a complete rip off like the other gal.
Although I wanted to purchase more of the Red Santa fabric, I could only find 3 yards of it priced at $65/yd., which is just too pricey for me); however, it sold out on Etsy at that price.
FYI, I will sometimes take the time (spend hours/days) to search the Internet for OOP fabric, and I can usually find odd Quilt shops all over the country that have the fabrics that I need at the 'original' prices, and cut and paste the links w/photos into a PowerPoint file in case I need more of something.