I have recently mailed in a mail-in rebate for Orajel, allowing me to pay only a fraction of the price. I think the original price was around 4.70 and I sent in the easy mail-in form for $4. I received the check about 3 weeks afterwards. If you see any products like this with the mail-in rebate option, always mail it as soon as you can to get your money back. I only paid $0.70 for a product and I was happy about it.
It's definitely important to mail it in as soon as possible so the offer doesn't expire. Remember to hold onto your receipt and barcodes because most require them as proof of purchase. Don't forget that you'll have to pay for the postage (sometimes both ways), so if a rebate is tiny, it might not actually be worth it after all.