The Pez dispensors ain't worth squat really. I've got a set of all 9 OT ones. They came either carded or bagged. There were also 3 additional ones released for AOTC (plus 2 rehashes). Mine were all bagged, though I think they look much better on a card. But yes Chris, taking them out of the bags will ruin what tiny bit of value they even had (which is basically what they retailed for, if that). But since these are basically worthless, you shouldn't be picking these up if you're interested in their value really. But rather just for the hell of it, as they're fun and unique (and occasionally useful) collectibles.
Here's an auction for the 9 OT carded ones for $10, that ended with no bids on it - if that gives you any indication of their value (or lack thereof)...Complete set of 9 Star Wars Pez
Here's an opened set of all 9 (with a few extras) that ended for $2.24...13 loose SW Pez
Here's a COMPLETE set of all 12 Pez dispencers (including the 3 AOTC ones) that ended for $11...Set of 12 SW Pez
Here's a case of 24 that ended for $12.95...24 SW Pez Case
Bagged set of all 12 for $10 ending with no bids:Bagged set of 12 SW Pez
Best way to ever check on the value of stuff, is just to type that item into eBay's search box, have it search (which will give you active auctions), and then click "Completed Auctions" (over to the left). That will give you a pretty accurate idea of the current market value of pretty much anything on the planet. Here's the completed SW Pez auctions (all 396 of them)...Completed Star Wars Pez auctions
So anyways, you can see that they ain't worth scratch - one dollar each at most
. But they're fun little collectibles to have anyways. Open 'em up and enjoy. Or for just $5 - $10 go get yourself a second set of all 12 and keep it sealed so you can have it both ways...