I've heard that there are travel size OFF! insect repellent at Walmart priced at 75¢ and there is a 75¢ coupon on coupons.com (Use zip 77477)
There is also a $1.50/2 OFF! products Tear Pad that I've seen around.
This TP would allow you to get 2 free!
Let me know if it works for you :)