Well, according to this small coupon book, you will be able to save 10 dollars if you bought both the R1 2 disk set and 5 disk set. However, you would need the proof of purchase and sales receipt from both of the sets you bought.

Since I got R1 2 disk set for free, there is no sales receipt. I can't get in on this deal, Then again, I only paid US 20.05 in total for R1 2 disk set and 5 disk set. There is no complaint here.