Was going to add this to the 'found on CL' thread but thought it was interesting enough for it's own post. (i have no affiliation)
1999 Boxster electric conversion - $7500
https://jerseyshore.craigslist.org/cto/5618946089.html
some more details on his blog....pretty cool stuff, I'd just be leary of the cost to replace the batteries, as it's been sitting for two years.
Electric Boxster Conversion