I can spend a LOT of money on craft supplies. Even if I just run to Michaels or Hobby Lobby for paper or a stamp pad, it's hard for me to get out with spending less than $10. That doesn't sound like much, when you do it every other day, it adds up. It doesn't help that they just opened a Michaels within walking distance of my house- like I would actually walk there, but I could, if I wanted!
Anyway, even with all this excess, some of my favorite craft supplies are cheapies. Like shipping tags- 100 for $4.00 and glue sticks from Costco- 20 for $5.95.
And how about these stamps from the $1 section of Michaels. The stamps were $1, and the acrylic block was another $1- but I can use it for more stamps. I've used this set a bunch, especially for mail art.
This glitter glue was three bottles for a dollar at the Deals store. I made one of those "clean-up collages" where you use the scraps on your work table and used it on the edge. It's not exactly the same as the loose glitter, but for the price and ease of use, I can think of a lot of ways to use it.
Of course, one of my favorite ways to get inspiration is sharing goodies with other artists. I traded mail art with Christy Secora, and look what she sent me.