Last year went to a job where I knew the guy worked for Hewlit Packard as a printing guy.
At the time, I was having problems printing 180 gms postcards on my b&w laser printer. They would not go through the printer.
It was a project where I wanted to print reminders on postcards rather than sending envelopes.
I asked his advice and he said....heres a HP colour laser printer in my garage...you can have it, it's full of toner and there is a box full of toner you can have with it!
The printer is bloody huge, but it's the best tip I ever had. With the toner it's worth hundreds.
It will last me a couple of years and then it goes to the dump unless I find cheap toner off ebay