Hi Meg - I learned about Gamsol from one of Gina's technique videos about a year ago and have loved the results ever since. I looked for Gamsol, couldn't find it, so had to research it and here's what I found. Gamsol is just a brand name for Odorless Mineral Spirits - like Kleenex is for tissues. If you find and online retailer, you may pay for the roof for shipping of a flammable product, so stick to a bricks and mortar store. Once I found out OMS was the same, I began to see it all over. Michaels (in my area) carries several brands. I picked the dinkiest bottle they had, it was called "Mona Lisa OMS." It was very inexpensive and I feel I've barely used any in the year I've had it. I also bought blending stumps, but cheap-os. After this video I think I'll invest in more sizes and better quality. I didn't spend $25 on the nifty bottle Gina uses, instead I bought a round art sponge and small plastic vial with a tightly sealing lid, like an old school plastic film canister. I cut the sponge (like you probably have in you stamping supplies already) into 1/3s and stuffed a piece into the vial. Then I pour the OMS over it as needed, just to wet it. To use, I dip my blending stump into the sponge, rotating it as Gina shows. The OMS soaks into the stump just as it does on the video. And then you're off to the races! You definitely need the nail file or sand paper to clean and prep your stumps. Good luck!