My guess is that Pegasus Astro would also be keen to buy direct from Prolific. 
By the way my other mount ( SW AZ/EQ5) has a built-in Prolific chip, and I can swap over the direct USB cable link to a Hitecastro USB to Serial cable. It turns out this cable also has a Prolific chip in it, and the only software change I need to make is to go from 115200 baud to 9600.

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