If you happen to be near your neighbourhood Radio Shack, stop in and you might find some good clearance deals. Look for the items with blue or tan on the price tags.
I stopped in today to look for an audio transformer to build a sound card interface for the radio, and ended up coming out with a couple pieces of 4.5x6" perfboard, a resistor component pack, and a capacitor component pack that were on clearance. The perfboard was less than $1.50 each, and the resistor and capacitor component packs were $7 and $6 respectively. The component packs are normally in the $25 range I think. Although I've already got plenty of resistors and capacitors, it was really the boxes that I wanted. I think of it as a two good component boxes that come with free resistors/capacitors.
My store also had a few Arduino shields that were clearance marked as well.
Might have to pay a visit to some of the other Radio Shacks in the area.