Here's my shopping list, all from Sparkfun. No, I'm not a fan boy. Thanks for asking.
- Diagonal cutters, $2
- Multimeter, $15
- USB Bit Whacker, GPIO on the end of a USB cable, $25
- MSO-19 USB oscilloscope and logic analyzer, $250, looks pretty cool
- Jumper wires, $25
- nRF24LU1+ breakout board, $35
- Total $352, which seems pretty reasonable for all that cool stuff.