$299.99 seems like a decent price for this:
SuperMicro Storage Array JBOD 4U SAS2 24x Caddies 2x PSU | eBay
It's barebones, no mobo/cpu/ram/hdd, but rails and hard drive trays are included.
SuperMicro Storage Array JBOD 4U SAS2 24x Caddies 2x PSU | eBay
It's barebones, no mobo/cpu/ram/hdd, but rails and hard drive trays are included.