Greetings,
If you put the machine on eBay, it "should" bring about $350.00. Knock off the 20% fees for eBay and PayPal, you would realize $280.00.
The good news is that it appears to be a Universal model and can be converted to other calibers.
I could not read the label in the photo. Is it, indeed, a genuine Star machine, not a Phelps? The tool head will also have "Star San Diego" stamped on the top flange near the sizing die.
I agree, $100.00 is not an acceptable offer.
Cheers,
Dave