You can try IKEA. I bought a bunk bed like 6 years ago for my nieces and it's in pretty good shape. Good luck finding one!

marlo thats where my parents got mines and my bros. They are metal have a slide and feel really comfortable. I think they were only $250

I just bought a metal tubing bunk-bed for my grand children at IKEA. I chose this one because they are boys and I know they will think it is a jungle gym in a few years. I picked it out by walking around and shaking all the bunk-beds. This one would not shake. I is a dull gray, very spartan. If you like, you could paint it any color with rustolium, for a more aesthetic appearance. Price w/o mattress $150