Today I got 2 Moda jelly rolls from a seller on ebay in a flat-rate envelope.
I've also gotten lots of yardage in one. Not even wrinkled!
No joke.
There are some very reputable sellers on ebay who charge very little for shipping fabric. You can get many more than 2 charm packs in a flat-rate envelope. I got 5 once plus other yardage in one. PM me if you want some good ebay sellers of fabric.