Yes, there are multiple price guides available. For example; Hagerty’s Cars That Matter Price Guide (typically post-war vehicles to approximately 25 years old with a few exotics listed, up to about 15 years old). If you want to consider buying one, call 877 872 7772 and indicate that you are a Hagerty Plus member, member number 619496 and provide your name, address, etc. There will be a discount. Also, for older and newer cars (i.e. a broader range of vehicles), there is the Old Cars Price Guide, which is available at book stores and sometimes at larger magazine stands.  I believe Kelly Blue Book also does a collector car book, as do N.A.D.A. (National Automobile Dealers Association), both of which might be available at larger bookstores.