Built a Seq V4L last year, not in a case but complete. 200 shipped in US. Also have a Quad II expander - add $50 if you want it as well. I bought more GM5 chips than I needed and have pcbs to go with them. $15 each shipped. I have 3 Gm5 chip/pcb combos available.
I also have a few of the Midi Encoder pcbs I ordered last year and never got around to using. $30 each shipped in US (or $24 plus shipping elsewhere - went back and looked at actual shipping costs). Have to look but know I have at least two. Thread here:
I also have a GORF midi sequencer for sale - $100 assembled.