One more thing, watch the wording on the rebate. Likely you can only do one.
Some companies let you do more than one on certain items.
Bayer and Renpure come to mind.
There is also an advil deal for cheap advil (not free) -how many you need for the deal depends on the price at your store and it requires coupons. Search the deals sites if you need advil.
I'll go back to google and explore the deal-sites for some decent Advil coupons.
https://www.thepromotionaloffer.com/hmsdrtv/