Does the set you are talking about look like one of these sets? If it looks like one of two sets on the left $100 would be too high a price to pay. If it looks like the third set from the left (in good condition as you stated) $100 is a fair price. If it looks like the last one, of which I have only a single, $100 is a bargain.

Richfield Hi Octane.jpg
Regards, Jim

I collect gas pump salt and pepper shakers
and the plastic coin banks made by AVSCO.