record show experiences

I went go a record show yesterday.  Lot of junk.  Took a couple of records to trade or get cash for them.  They together were worth at least 150.00.   Guy offered me 20.  They are mint.  He even said he would put one of them in his private collection.  Lol.  There was a lot of junk.  Frustrating.  Are their any good record shows in the northeast USA?  Is it this way at all record shows?