Why not just do the coins like eeryone else is? http://www.flyertalk.com/forum/miles...can-coins.html

Costco is great because they take m/c visa online and give cash back when you return at the store. Just have the cash to make the cc payment so it does not cycle, and return before the costco return cut off date (varies by item). Think expensive laptops, watches.

Not that I would know.