Stalk eBay.
I set my darkroom up about 6 months ago now. You can often find very good deals on entire setups.
I won a Printmaker 35, along with some old paper, trays, thermometers, negative clips, contrast filters, and basically whatever was left in the sellers disassembled darkroom, for only TEN CENTS. I big TEN CENTS which was the starting bid and won. After $25 in shipping, it ended up being a grand total of $25.10 I think for all of that.
I also used my network of artists friends and told them what I was looking for. I ended up finding a local guy who sold me his entire darkroom setup for $150, which included an Omega B600. I got 5x7, 8x10, and 11x14 trays, thermometers, graduates, contrast filters, a print washer, tanks, reels, safelights, tongs, multiple enlarger lenses, negative carriers, and a host of other items.
In both of my cases I got fairly nice enlargers in working condition with all accessories. I'm certain that they are 'amateur' level equipment, but they serve their purpose at this point in my creative venture. When I find something that I am interested in, I do as quick but as thorough of a google search as I can before buying. And its been my experience, that if you are buying enlargers or darkroom setups from other film photographers who are going digital or shutting their darkroom down, most times the equipment is still in operable order.