Also, ZR-1's and Callaways do seem to be affected in the same way, it's just that their initial price was so much higher. I've seen many 1990 ZR-1's for around $20k for sale, and I've seen several Callaways that have been for sale for over a year due to the high asking price. I don't know what a 1990 ZR-1 asking $20k would sell for, but probably less than that, so if it sells for ~$18k, and a regular 1990 sells for ~$8-9k, then the ZR-1 is about twice as expensive, while they were twice as expensive when new too. However, it seems they do hold up a little better as a 1990 would actually probably sell for $7-8k or so, and I'm sure some 1990 ZR-1's go for mid $20's and possibly higher for a real mint/desirable one.