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.
Although I've seen that set offered currently on eBay for over $200.00, in my opinion it is not worth more than $25 to $50. As we all know anything is worth whatever someone is willing to pay!