Any "deposit type"soda bottles and copper tea kettles. Of course they're all pricless!
I have a 800 volume DVD collection, 1500 books and a collection of original art and photography - 50 pieces - some really expensive. I love my collections. Unfortunately I may lose them. They're in storage and I can't afford to get them due to losing my business last year, and struggling to survive. (Any/all donations, graciously accepted!) ;-)
I appreciate that thanks, however to complicate things, the storage is 3000 miles away and given my circumstances, I'm not getting out there any time soon :-(.
I collect movies. They are probably too young and still easily available to have much value. But in a household of OCD sufferers, they are invaluable for staving away the night terrors. Comedy is especially prized in our home.
Im a book hoarder...I get emotionally attached. Like more books than furniture. Moving is always a biotch.
I collect severed heads.
I collect old Cane English Fishing rods, and old English Fishing reels, I have quite a few of each. Some are over one hundred years old, some I still use, and some I don't because of their value.
I still have my old collection of garbage pail kids from when I was like ten... not worth much monetarily but they have some sentimental value.
Old cigarette lighters the table top kind. Some are silver but mostly the value dipends on how many of a type were made. I have them in Glass cases. for display.