I was on RRR radio a couple of years ago spruking about this, Bonsai on a shoestring. The idea was to promote Bonsai as a passtime for people on low income. I believe it can be done using whatever you can get your hands on from seeds, to pruning gear, to materials needed to employ techniques, etc.
I have grown a Coprosma repens from a garden weed, using shoot pinching to control growth, a bent fork and a take away chopstick for a root rake,$2.40 scissors and recycled soil for a medium. The pot is a bunnings sale item, coffee brown terracotta 31cm bowl reduced to clear at $2.00. All this tree has cost me is time and a few dollars on a pot and fertilser.
If you believe Bonsai is unattainable due to the cost of material and equipment to produce a good looking tree, all it takes is some spare change, Ausbonsai

My Coprosma may not be a show quality tree, but it looks alright and it has a story that goes with it.
At the end of the day, Bonsai is a hobby/art form/learning curve/passtime/therapy that you can get a lot out of.
Can't post pics at the moment, compooter is not talking to the phone
