wheres the cheapest place i can find a lipo sack?

I would charge them. I stored 7 lipos half discharged and had every one puff one cell - the cell that was facing up. I keep all mine charged now, no more half discharged business. If mine don't get used every month, I discharge them, then fully charge them.

I was gone for almost 3 months (wasn't planned to be gone that long).