I didn't feel like paying anywhere between $50 and $100 for a dew strap so I made my own, based on this link
http://www.deepskywatch.com/Articles...ew-heater.html
the wire cost $7 from Jaycar $2 for a couple of RCA male plugs the wire and everything else I had, total cost $10 plus an hour of my time.
I have a Pegasus Power Pocket Advance which has two dew heater ports software controlled.
One for the EON110EED the other for the guide scope