At least the $50 is for TWO shelves!
Here's one on ebay for $15...
IKEA White Lerberg White Metal Media Storage CD DVD Rack Shelf Brand New S35 | eBay
But it's $28 with shipping...
Maybe try the Craigslist or Kiiji (depending on where you are)?
I was going to suggest having one made, but you couldn't get enough labor for $25. Can you make one yourself? Or find someone who could make it for you without labor charges?