I called Coors about a $7.50 & $5 rebate that were exactly same (same offer #'s, requirements, name ect...) and they said that as long as the rebates are for different amounts, you can do them both. So it would be a limit of 1 $5 refund & 1 $7.50 refund per address. I'm sure it is probably the same with them all, but there is usually a 1-800 number somewhere in the fine print that you can call & ask questions.

HTH!