I bought the Medusa directly from their website.

http://www.medusaproducts.com/motors/036-V2.htm

It was on the backorder list but only took a week to get. Give them a call (508) 675-0200 Monday - Friday 10am to 5pm Eastern time, and see if they have them in stock or when they will get more. They are excellent to deal with very customer friendly.