Wow, y'ain't askin' fer much are ya! LOL!

My suggestion, depending on where you are, would be to hit every gun show, podunk pawn shop and flea market I could find. Advertise in a newspaper, Thrifty Nickel, electric co op newsletter.
What you're asking for isn't impossible, just hard to locate.
My very first "gun show" was in Houston's "Astro Hall".
HUUUGE!
We three gun store employees were sent there by the owner to locate a Win M54* in .257 Rbts. (*forerunner to the M70). We found THREE!
What you're looking for is out there
Don't give up!

IN THE MEANTIME:
Educate yourself on the preeminent makers. Winchester, Stevens, Savage, L.C. Smith, etc, etc...
Also, learn to identify "Damascus" steel barrels. Get someone to educate you on grading bore conditions, blueing conditions.
Learn the differences in "box lock" and "side lock".

ALSO.....learn to know when a "clunker" just might be a "fixer-upper" well worth the money*....and vice versa!

Good hunting!
Good luck!

*found a beat up Win M12 in 16 gauge. Real clunker!
Were talking black electrical tape holding magazine to the barrel bad!
Walked out for a $100 bill! Tax, title and license!
Eighty bucks worth of parts from Nu-Line custom guns and I have a really nice Win M12 in 16 gauge with a set of Cutts Comp tubes! Total investment $200 (extra Cutts choke tubes)

It's out there! Don't give up!