The Glyde-In has been one of my favourite places for awhile now. They offer cheap courses & learning experiences on just about anything you can think of. I have done a day's kayaking on the Swan River with a very experienced instructor (to see if I liked it), and also Chi Gung every week for a couple of terms. I intend to enrol for a coming course called 'History of Fremantle's Port'. Every quarter I pick up their programme for the term (you can become a member & receive the programme by mail too). They offer enormous variety (for example, this term they are offering more than 40 courses.) Yearly membership is $20 for me.

Approximate cost: $10-$40 avg per course