Ebay has several types of electric Vacuum Pumps for vehicles selling on Ebay. But you need to be careful as some of the Ford type vacuum pumps people are selling are not rated for Power Brake Boosters.
The one that are sell for close to $300 and have a pressure sensitive relay to shut the pump of when the highest vacuum is reached.

Also, member Stevo believes his vacuum pump failure was caused by too much play from a worn IP Timer Bushing. When you replace the IP Timer you might want to check the Bushing clearances.

Excellent photography.

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84 300D, 82 Volvo 244Gl Diesel