My presale of apple cassette interface cards is due to end on 9/30/2010. The presale price is $75. After 9/30 the price will go up to $100, unless you buy an ACI at the same time as an Apple 1. The bundle price will be $75.
I expect the ACIs will be shipping by early November.
I currently have a preliminary manual online at:
http://www.willegal.net/appleii/aci-v0.12.pdf
and some information about the ACI at