Homebrew PCBs

Hi all.

I have been looking into making 4 layer boards. I have most stages 
sorted but the big stumbling block is the bonding of the layers 
together. It seems a special press is required that has enough pressure, 
exhausts the gases away and generates the correct temperatures. I am 
surprised its so difficult. I have been told second hand presses cost 
\ufffd4000 to \ufffd5000. This is totally out of budget for me. Has anyone any 
experience/thoughts/comments on bonding boards together?

Thanks

Trev