Cracked rear panel, replacement parts?

I dropped my 2013 Nexus 7 FHD WiFi only on the most unforgiving surface outside of lava, a ceramic tile floor. While my screen survived mostly unscathed — there is a slight dent in the bezel — there's a crack in the rear case. Most everything on eBay is either damaged or expensive, and the only other place I've found selling the part wants $40 for it. Are there any cheaper part suppliers available?