Check out some of the coupon websites - like A Full Cup - they post the deals for different stores each week, including CVS and Walgreen's (and others like Target). I have about 20 bottles of body wash (LOL -maybe more) that I paid between $0 and probably $.50 for. These run $5.99 normally - I keep saying I'm going to quit buying that particular product since we have enough for a really long time (years!) but it's hard to pass up free. I also have enough razors to shave the legs of everyone in my neighborhood for probably a year!
It's not just clearance items, in my experience - in fact, the stores where I shop never seem to have the clearance items that they're supposed to when I go there. Many times when a new product comes on the market, there are big dollar off coupons for it and the stores will have it on sale as well, trying to get people to try a new product.