The Dollar Tree around here has the absolute best cleaning supplies. Bleach (as mentioned earlier), ammonia, toilet bowl cleaner, dish soap, etc.
I do buy laundry detergent there but it seems really good. Three kids, a lot of grass stains and other dirt on their clothes.
Every once in a while I make picture frames. I get $1 frames from the $Tree and use the glass and backing stand-up doo-dad. I even bought the pedometer that counts the strokes that my stoker takes there three years ago and it's still going. When my kids need gift bags I always go there. Two bags for a dollar instead of $3.99 at K-Mart? Hell, yes.
I don't mind spending money on something that's worth it, but I won't waste it.