Gems:

Fourmost 154 Miter Sander: About $17.
Hobbico Voltwatch: About $12. Never fly on a weak battery. (4-cell only)
Clear 3/8" heat-shrink tubing from Fry's at $2.29 for 3 feet. Secure those servo extensions and be able to see them.

Junk:

CBA Tatone cast aluminum spinners at any price.
Hitec 225 servo used on anything requiring the torque it's supposed to have OR any reasonable amount of throw.