HaHa, I just did this and posted about it on another thread. I shopped at the consignment store. Found something, but thought it might be Ikea. ID'd it on Ikea's website and then looked for it on Craigslist. Bingo. I actually wanted two and found them from different sellers. Much as I hate Ikea, their stuff is consistent. Paying half price for them made buying Ikea a little more palatable. When I'm done with them, I can probably sell them for what I paid. Go to Ikea's site and identify something that would work for you. Then hop on over to CL and see if you can get it for less. Also, if style is flexible, try freecycle.
Yeah, boards, cinderblocks and/or ladders all work, they're not the only mustachian options out there. I live in earthquake country, so safety is an additional consideration.