I have never been to the Northeast Show but most marble shows have a day for the actual show where marble collectors have their tables with marbles and marble related items for sale and the show room is open to the actual public so there can be a lot of interesting items show up. Also, in the day or two or three ahead of time, there is "in-room" trading where the marble collectors that are staying at the hotel/motel can open their doors and collectors wander from room to room - buying, selling, learning (the important part). And, yes, you can haggle, cajole, bribe, plead, etc. to put together a marble deal. And, yes, there can be great deals. On the lower value end (say up to $20 a marble), people might have a box full of marbles that they are selling at $3 each (or $1 or 50 cents or $10 each. The only caveat is to bring a light so you can examine the marble to determine their condition. That makes a big difference value-wise. So, yes, go to the show and if they have in-room trading, take the time to go a day early and meet people and buy, sell, learn....