Not sure where to ask this, but here goes

Hi guys, I'm interested in learning the Cajon, have a musical background but not in percussion. (Guitar/bass/piano)

Three simple questions I can't seem to find the answer for.

1. Where to buy? (Checked garage sales but out of stock, and bentley had no stock too)

2. How much? (Saw some online shops like Doremi but they didnt list the price)

3. Can it be self-taught? Easy to learn? I'm looking to learn an instrument that can be self taught.

Thanks