Well Nate I can vouch that paying $40 for a Badger would feel like a rip off when you could get a Testors (Aztec) external mix for $5 on sale at Wal*mart, and a internal mix, double action for $10 more. I have 3 total, two external that I use for basic paint, and the internal I have not yet tested.
You might have more luck selling them now, as it seems most Wal*Marts have sold them out and not re-stocked, although some have re-stocked.
As for use, I'd suggest getting a cheep single action, and practice, then 6 months or so down the line pick up a double action.