Cheap/old consumer devices to recover FPGA boards from
I'd go for anything Video (especially HD video) related:


these boards often have reasonable FPGAs
tend to be on a reasonable host interface
are usually rather hard to kill due to the studio environments 


One of favourite FPGA projects of a friend of mine, http://nsa.unaligned.org/, used HD transform boards. 

Another of my personal favourites that I abused a bit myself, is a BlackMagick Intensity HD capture card, coming with a nice set of video peripherals, a decent microcontroler, and an Spartan 3. 

After some abuse, it's probably the cheapest non-academic devkit for PCI/PCIe work on FPGA. It seems to be going new for $120-$150 on ebay these days, and you can probably score one with damaged video interface chips.