These work really well--and you can buy them in different depths.

I bought mine first a Target, so you might check there, if you've got one near you.

The $25 packs have a LOT of strips; I don't consider them to be "very expensive."

Here's another one, in thick, clear acrylic (like Plexiglas or Lucite)--made, I think, by the folks who also make the NeverMT but sold through CabinetAccessories.com I don't know how much you get for the price.http://www.containerstore.com/browse/Product.jhtml?PRODID=60285&CATID=183&searchId=5205313&itemIndex=3

These are thin, but they're ridged, so I frankly prefer the white ones in the link below

Here is a link that might be useful: custom drawer organizing kit from Container Store, also once at Target

here's another version of the white ones, w/ a slightly better price (only 3.5 inches high, but that might be enough)