My sibs and I went to the Antique Road Show in 2008. It was held in Wichita. We applied for tickets well in advance--I want to say 5 or 6 months. The tickets were free but later people were scalping them.
We inherited a house full of junk and were wondering what to do with it: -a fur jacket that went to the 1917 Rose Bowl on our great grandmother's shoulders, boxes of old, wooden, hand crank telephones--Like the one June Lockhart used to call the sheriff when Timmy and lassie didn't come home from the blueberry bog. My sister took some garage sale wedge wood that turned out to be the real deal.
It was a blast. We could each bring three items. I chose aring, a marble and a painting that my mom bought from an antique store (Not only was it worthless, it made the art appraiser cringe!) My brother made it onto the blue carpet with a toy Pepsi truck in mint condition. It carried dozens of clear plastic bottles in tiny cartons--144 bottles because Grandma always made us count them and no one left that room until every bottle was in its carton! The truck was still in its box and not one chip in the paint. The family joke was that our grandmother never let us play with our toys so they were like new. This one ended up being fairly valuable. If you watch the Wichita episode you will see my brother being interviewed. I picked out the shirt he is wearing. (You should have seen what he was going to wear!)
My sister had our grandmother's wedding china--Bavarian. The family treasure, carefully wrapped and carried from farm to city in a wagon, from Ellinwood Kansas to Las Animas, Colorado, through a dust storm and in a model T. Then the china went back to Kansas and then to Spring Texas. It was always painstakingly wrapped and kept in a china cabinet. No one ever remembers it being used because of its great value. Turns out it is pretty much worthless--about 10$ a place setting. It would be funny except that when her house in Texas was flooding and my sister had to evacuate, she chose the china over their new Gateway Computer. She still gets spitting mad when she thinks of the computer floating away while she stashed the china in the attic.
I took a ring--5 tiger eye opals --that my aunt and uncle had brought me from Thailand. I got to meet the jewelry guy and we had a nice talk. It appraised exactly as our hometown jeweler had appraised it. The surprise was a marble that I picked out of a drawer just as we were leaving. It had Sandy. Orphan Annie's dog on it. There had been maybe twenty of them in a bag of marbles I inherited from my Dad. Little Orphan Annie, Punjab, Daddy Warbucks--lots of characters in cute line drawings on white marbles. The toy guy was pretty excited. This one marble was worth 75$ and If I could make a whole set of them...! Unfortunately the other 19 or so marbles were scattered in yards and storm drains up and down 26th street in Great Bend, Kansas. And had been for forty years.
If you want a surprising big price object, try old marbles. --s6