Dog gone it! I sooo wish there was a Tractor Supply somewhere in San Diego.
A #41 chain is $16.99 for 10 feet. Fastenal, just down the road from me, wants $27 for 10 feet, which is still not that bad of a price, but AFAIK you need a resale account to buy from them. They are a wholesaler only. I am still going to try them though.
On a previous note......
Here's the switch instructable, I knew I had bookmarked it!