I just went ahead and ordered a scanner, and I guess I wanted to clarify a couple of points about the rebates. I couldn't find anything for the $20 "Instant rebate", because that's already included in the price on the site (normal list price = $79.99?). In order to get the additional $30 rebate, bringing the price down to $29.99, you can go to the <A href="http://www.officemax.com/FreeDelivery/rebates.html">MaxRebates</A> page, click on the redemption form, and print that out (looks crappy). If you look down towards the bottom of that page, at "Tally Sheets", clicking on (1-15) will show that rebate offer #2 (of 92) corresponds to the scanner, and is the number you should write on your receipt.
BTW, the rebate from the Acer page expired on 2/29. Even if it hadn't, both rebates would require the original UPC code, so you would have had to make a choice anyhow.
Cheers,
Dave