We use the Orajel non-floridated toothpaste for my toddler and it can get pricey. This doesn't quite cover the cost, but makes a big difference. No exp date that I could see. Haven't sent the rebate in yet, so it's not verified.
http://www.orajel.com/rebate.htm
Also found this, which is good if you have kids
http://www.prontoplus.com/rebate.cfm