My Coke Rewards has some nice coupons available for relatively low points.
You can request a coupon for One (1) Free Ritz Cracker Nabisco Product for 150 points.
You can also request a coupon for $3 Off 12 Pack for 160 points.
The $3 Off 12 Pack coupon can make for a free 12-pack if combined with a sale.
These are mailed coupons, which generally make them easier to redeem than if they are printable.