Anyone know where to find a electric start kit for a '70 sporty and about how much?

I have occasionally seen them on eBay. I have seen one company that makes kits where you have the option to but either kick or electric or both. I recall about $500.00.

I see in my J&P catalog they have a kit for 1971 to 1980 on page 252. Not good news for a 1970 guy.