I posted this deal over the weekend, but it looks like it reset AGAIN! You can get a $20 Toys R Us voucher for $10 here. This is great because you should also be able to use coupons and sales with your voucher!
Fine print: Expires Dec 24, 2012. Limit 1 per person. In-store only. Not valid outside USA. Not valid until 11/23/12 at 5PM. Not valid toward Buyer Protection Plan, gift cards including those for digital content, photo studios, phone orders, special orders, assembly fee, breast-pump rental fee, delivery fee, or shipping & handling. Valid only on a purchase of $20 or more. Not withstanding anything above or below, vouchers not valid with Toys”R”Us after 12/24/12. Thereafter, Groupon will refund amount paid in Groupon credit for unredeemed vouchers