Rakuten Shopping (formerly Buy.com) offers 16% back (in the form of Rakuten Super Points) on all purchases via coupon code "GET16X". That's tied with our expired mention from a week ago as the best such promotion we've seen for these points. (The previous best was 13% back last summer.) These Super Points will convert to a Rakuten Shopping credit 15 days after shipment and expire 45 days thereafter. A maximum of seven qualifying items and a cash back value of up to $250 will be allowed. Deal ends April 14.