Honestly, they can go for a boat load, especially if you want a BG-42 or a model other than sterile ti. There is a lot more demand than there is supply. This is a good place to find one, especially if you are okay spending a little time hunting for the right one.
You can post a want to buy ad on this forum--although you will likely have more luck if you have an interesting CRK to trade, which you can post in the trading forums. Additionally, one of the upgraded memberships will enable you to private message with other members (the trading/WTB might only be open to upgraded memberships? - but it's worth the money if you are hunting a particular knife because a member here who sees this thread and could potentially connect you to the knife could then contact you.)
Finally, purchasing a CRK from an established member here is much more desirable than on a place like eBay, as Ernie pointed out. Firstly, because people here are knife people, they often know a lot about CRKs, and you can verify that you are buying from someone who is reputable in the department of knife transactions. Further, in the sell threads, members post pictures of the knives, and other members view those pictures...this is an informal peer review process in the event that a fake were to be posted. I've not personally seen a fake CRK here, but I have seen TONS of them on eBay, quite a few of which eBay fails to catch and get bid right up to what the cost of a real one should be--in some cases being sold by sellers with great feedback who may not even realize that they have a fake CRK. This forum certainly provides expertise where you can verify as much as visual pictures can...if you buy on eBay, you can also always immediately send it to CRK for spa treatment, who will obviously verify its authenticity.
There are a few authorized CRK dealers that deal extensively in higher end used knives, including CRKs. I am not sure if they can be mentioned though given they might or might not be forum sponsors, but they are not hard to find as they are on CRK's website. If you are really, really set on getting one, you could even reach out to the authorized CRK dealers that don't have websites, to see if they by chance have any old-new stock, or used Classics.
