Price is in the eye of the buyer and the heart of the seller. Whatever price you can negotiate that satisfies both you and the buyer is what they are worth. I have built kits I would not "take $1000" for, but if someone walks in with a crisp $50 they could probably walk out with it. Our builds are part of us, but if you are seriously intent on selling them do not let your nostalgia get in the way of a fair price. Just my $.03 (inflation price).