I keep an eye on Gumtree for free to cheap plants, I also am a member of many buy/sell/swap Facebook pages.
I also have made friends with a tree lopper..
So far using all the above, I have scored 8 bottles brushs, 1 China doll, 1 umberalla tree, countless fruiting fig cuttings, 1 ficus, 1 olive, 2 pines, massive jade stumps, lots of moss and baby tears and all for free, I've only dug out the bottle brush trees..
Others I've purchased cheaply are a large 3 trunk ficus and a orange jasmine.
Then you're got cutting/seedlings from your own stock, 15 Japanese maple cuttings, a few ficus cutting, chilli seedlinds(a bit of fun) and some juniper cuttings from a bonsai demonstration.
Some of what I've got now and I'm new to bonsai is from swapping or selling as well, so far I've paid for all my trees and benches from selling cuttings and plants.....
