What you need, and what Meade don't make anymore is a #909 APM...a port module that you could connect an autoguider to. However, if you goto this site...
#909 Clone, you can get a clone of the APM which is actually better than the original. That'll solve your problems as far as an autoguider connection goes.
Before I forget.... you'll also need a #505 USB to Serial connector and cable to connect the Autostar handbox to your computer and scope at the same time...goto
Bintel, they have them in stock.