There used to be a stickied thread like this, must have gotten deleted with the others.
Today I found ReNu MultiPlus contact solution, 12oz bottles, on clearance for $1.74!! They don't expire until April 2008, and the box includes an iTunes code. I picked up 2 (the only 2 left where I found them) and used a $2.50 MFC that went though without beeping, so I got the full amount off.
Yesterday the store I went to had the big (25oz?) bottles of Pantene Pro-V conditioner, packaged together with sample bottles of of shampoo and conditioner, for $2.xx. Can't remember the exact amount because I didn't buy it, I think it was $2.48, normal price $5.99.