As Patrik knows I recently picked up an HC+8 as well. There are quite a few of them floating around eBay as of late. I'd take a look there if I were you.
If you absolutely cannot find anything I do have an old Dataflyer 500. It "seems" to be non-bootable in my A4K but auto-booted fine in my old A500.
It doesn't offer any RAM expansion nor an external 50-pin port so like I said and absolute last solution.
