I just read that Metalbox is releasing an 808 clone.
From their mailing list:
The 8008 bass drum module is one frac rack space wide. Controls are
tune, tone and decay. Trigger input and audio output. It is the 808
Bass drum circuit with some tweaked component values for longer decay
and frequency control.
Price is $150 and they are now available to order. Will be shipping
in 4-5 weeks.