Looking for Paper Ephemera

I am searching for vintage paper ephemera. I am having little to no luck finding any. Sure, there are a lot of sellers who sell ‘vintage’ receipts, letters, postcards, tickets, etc. that they have found and scanned to sell but printing off digitals does not feel 'authentic'.

Where do these junk journal makers find all this great stuff? Old hand written letters, postcards, tickets and vintage books are the kinds of things I'm looking for. I don't know of any antique shops in my area that might sell this. More importantly, I'm not sure how much is a reasonable price to pay for this kind of ephemera.

I wonder if estate sales might carry some of these things. I never thought of that before. The thrift stores will likely have vintage books but not the other items I'm looking for.

If anyone out there has this type of old paper ephemera that you are willing to part with, keep me in mind.