I bought a pack of 3 bags from http://www.drybagsteak.com for around $20. Last night, I stopped by the grocery store and picked up my ribeye roast. It weighed in around 18 lbs at $11.80/lb. That's an expensive one, USDA Prime. I would've gotten USDA Choice ($10/lb) but they only had half roasts. All you do is drain them of liquid, place in the membrane bag, and seal using a vacuum sealer. It says in the instructions that horizontal food saver units work the best, which is what I happen to already have.
I've got this one scheduled to cut for my family's Christmas dinner, aged at 39 days. I'm starting another one next week for my wife's family gathering. Hopefully I don't kill everyone from food poisoning. This stuff is supposedly the cat's meow! There is also the issue of self control, not slicing this thing up for a football Saturday.
I'll update with pics as the aging proceeds.
