Also available in stores . . .
I just bought Mrs. Stewart's Bluing at my local Stater Bros. supermarket here in Riverside, California. I don't remember how much I paid for it, but I didn't have to pay shipping!
(Not that I have anything against Vermont Country Store -- I love that company and have bought a lot of different things from them. Just saying, be sure to check your local grocery stores -- you may find it on the shelves.)
Speaking of Mrs. Stewart's Bluing -- it's the only thing that has helped with the yellowing of my white cotton underwear over the last two years since I bought my GE Harmony agitatorless top-loader. I put a drop in the fabric softener dispenser after I add the Downy. You have to be very careful that it doesn't touch any clothing, or even the dispenser itself. Powerful stuff.
Chip