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When making a listing for large or expensive items, please include your budget and location. That will help you match with a seller that might have the item you are looking for
Are you looking for either of these two particular more recent versions and models, or a larger bugle Conn sousaphone generally? If a larger one generally, in addition to the 20K and the modern 40K:
20K are probably the most numerous (I played one in grad school);
22K is the fiberglass version;
38K is the pre-WWII version with a 24-inch or 26-inch bell with a standard valve set (I had the use of one years ago);
40K pre-WWII is the 4-valve version of the 38K with the standard valve set.
I am mainly looking for these two, with emphasis on the 20K one though. I would love to have the 40KW model but I have only seen new ones for sale and they are pricy.
I have a crush on the 20K, the short action being one of the properties that makes it attractive to me.