If there were such a thing as a BBB of True Dungeon, Lazlo would get high ratings.
When it comes to tokens, there is no "trash." Because of the trade program, every token has some value, even if no one ever would play with it. (No one wants to use a common weapon if they can help it, but even though they're very plentiful they're worth about 10 cents each because you can turn them into Dwarven Steel - not because anyone wants to buy one to use. Unlike, say, most MTG commons that people have a hard time giving away.)
And some collectors, like me, want to build sets of tokens so they'll want stuff no one would ever really use just to fill in the gaps in their collection. I think I paid $1 for the last common weapon I needed (a 2008 Sling, I think) for just that reason. Couldn't find it, had to have it or that gaping token-sized hole in my collection would have tormented me forever...
But there are treasures out there. Some tokens are worth over $1000. I can pretty much guarantee that if you had any of those, you'd know it. But there are some sneaky tokens worth more than you'd think. Most green-ink tokens go for about a buck - except Alchemist Pouch that brings almost a hundred. Most reds are about $4-5 - except weapons are half that, and Necklace of the Oak about 8 to 10 times more. Ultra rares average about $100, but some go as low as $30 (Sapphire Necklace) or as high as $500 (Horn of Plenty) but prices fluctuate wildly. (HoP is down this year because - long story - but will probably go up again in a year or two)
Point is, if you don't want to scour the internet looking for prices, having your collection looked over by someone like Lazlo (or a dozen others here I could name) isn't a bad idea.
And if you can make it to GenCon the Wednesday before, there's always a token party where you can swap with folks. Everyone I've met at these things seems very honest, but the rules are the same as anywhere else - if someone wants to pull you off to a corner to trade in secrecy, be careful. They may just value their privacy, but they may be trying to take advantage in one way or another. If they're making a fair offer, they shouldn't be afraid to let other people see what's going on.
If you want to post a list here, as Lazlo suggested, you could look at the Token Yearbook (link in the Tokens section) and focus on the Rares, Completion/Trophy and Ultra Rares, if any, if you have too many to post.
"Ceci n'est pas une pipe" - Magritte