Ten or more years ago, new bellows were the HARDEST things to find and when you could they were expensive. Now new bellows are being made in China (and elsewhere, but I only have experience with the ones from China) to a high standard. Thin and light tight, very reasonably priced. Multiple colours if that's your thing.
The variety of camera bellows that the sellers are making are impressive, and you can order made-for-a-specific-model and know they will fit. I have bought such bellows for Wista 45N and 45D, Toyo Field 45A, Toyo View 45, Rittreck View 5x7, a Toyo 810 bellows, and also had a bellows custom made to fit a 100 year old Japanese wood 5x7 camera I picked up.
Bellows aren't particularly hard to change, and if you are up to the task you can pick up some real bargains. Go for cameras that have their bellows in tatters and the rest of the camera is dusty but otherwise working and complete: these are the cheapest. Cameras with bellows covered in patches but sold as "mint++++ few leaks" but have parts missing or broken are often more expensive.
Note that original Toyo bellows have not aged well and even if they are unopened NOS or LNIB they will have a hole in every. single. corner. So buy a cheap Toyo Field 45a with ragged bellows and put a new one on it for $200.
Note also that folding wood field cameras almost universally have crinkled and creased bellows from being packed away incorrectly. These look bad and reduce the price significantly but are often light tight and functional. I bought an early Tachihara Fiel 45 with seriously creased bellows, and an immediately ordered a new Chinese replacement bellows. After receiving the camera the bellows look really bad but are light tight. They are apparently made from special sheep leather and are paper-thin, and I couldn't bring myself to replace them.
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