A few months ago I recorded a big series of more than 50 short instructional videos for the Quick Start to GarageBand course at MacVideoTraining.com, a new video training company co-founded by my former Inside Home Recording (IHR) podcast co-host Paul Garay. Some of their other training DVDs are available at lots of retailers throughout North America.
However, if you want a better deal, you need to do it online. You can buy my course, or one of several others from the company, with a 20% discount on any single video or bundle, through a new affiliate program at IHR. Just go to insidehomerecording.com/mvt and enter the coupon code ihr at checkout.