Here's a deal on the Sony DRU-820A, aka BenQ DW-1670, that I was able to accomplish without too much problems. Right now, Best Buy online is selling the drive for $69.99 found here. Now, Staples normally sells it for $99.99. So print the page out from Best Buy and get a price match at Staples. If you get the 110% guarantee, you could get the drive for $99.99 - $33 = $66.99. I only got a 100% guarantee, so it was still $69.99. Next, grab either 1) Sharpie markers or 2) Expo dry-erase markers to be 1) $66.99 ($69.99) + $12.99 = $79.98 ($82.98) or 2) $66.99 ($69.99) + $8.99 = $75.98 ($78.98). Then, use the $20 off $75 coupon here (credit goes to MissLeading on Slickdeals) to save another $20. There's a $20 mail-in rebate for the Sony drive and a $12.99 or $8.99 Staples Easy Rebate to submit. Since the markers are free after rebate, this would make the Sony drive roughly $30 before taxes.
I tried it and got myself a 1670 for ~$30. FYI, make sure to print the coupon wallet size to ensure the barcode would scan. It's a multiple-use coupon, not one-time.
Now I know there are many who don't like dealing with rebates, but for those who don't mind, here's another opportunity. Again, YMMV.