What are some common pricing strategies that you see when go shopping?

What are some common pricing strategies that you see when go shopping?
I always see the 99 and 98 percent items. (Things priced 1.99 so that it looks like less than two dollars, when it really isn't.) You would think that the public would recognize that by now, but it seems some people are still ignorant.

I also see the buy one get one 50 percent off (which is really only 25 percent off) and buy two get one free (which half off.)