I found this guy on eBay who makes really cheap 2 step acrylic risers. I bought a bunch of 2 inch tall risers, but they don't work that great for Japanese vinyl which are a bit taller so I asked him if he would make me the same 2 step riser, but five inches tall. He said he would and they are only $5.25 each!
2 step acrylic riser. First level is 5 inches, second level is 10 inches from bottom. 12 inches wide.
email him directly at custom_display@rogers.com and ask for the "Skullbrain 2 step five inch tall riser"
actually he has a bunch of great acrylic displays at his eBay store so check it out: http://stores.ebay.com/Canadian-Custom-Displays
the picture below is of the 2 inch tall variety, but you get the idea
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