It's very easy for others to spend your money!
Finding one example of a particular firearm and then purchasing does not seem like a good way to go about finding a Duck.
Take your time, go to Gun Shows, peruse reputable on-line dealers and let your friends know what exactly you are looking for.
As with any item(collectable?), there are ranges in prices/condition and deals to be made but once you find what you are looking for, then it's time for action.
"There is nothing in between" is a myopic way to view purchasing.
There is always something in between, the job is to find the in between and this may take some time and research but it's a journey that can be interesting!-Dick