Blue book value for a 1973 Yamaha GPX 338 snowmobile?

Well, honey, I hate to break it to you, but the blue book value for a 1973 Yamaha GPX 338 snowmobile is about as easy to find as a yeti in the desert. That thing is so old, it's probably worth more as a vintage relic than as a functioning vehicle. You might have better luck selling it to a nostalgic collector than trying to get a fair price from a standard blue book value.