Source of 2112 SRAMs?

[Ethan Dicks]

I just picked up a Heathkit ET-3400 that looks in pretty good
condition *except* no SRAM.  From browsing the docs, it seems I need 2
(but could use 4) 2112 SRAMs.  Unfortunately, in all of my kit, I've
never run across them.  I have a tacklebox full of 2114s, and a small
box of 2102s, but no 2112s.  Yes, I could make a socket adapter for,
say, 2101/5101/1822 SRAMs, but if anyone knows of a place I could get
2112s, that would be handy.

If they are semi-unobtanium, I might just have to hand-wire a modern
SRAM (and EPROM) socket up to the 40-pin expansion connector, but at
least being able to get to the "CPU UP" message would be nice.

Thanks for any pointers,

-ethan