One. Kill the shrink wrap. Unless it's a mint copy of a 20 year old book then there's just no use in it and it (obviously) puts people off.
Two. Invest in "Bundle Boxes", by which I mean some medium sized boxes that will fit your bundles and don't do "all my stock all the time" sales - do "we rotate our sales on older goods per month sales". I don't know exactly why it works, but creating a small (but managable) sense of urgency in customers sometimes works to get them off their behinds and pulling out the wallets. If the bundle boxes themselves have some strange value then even better. I've never priced custom boxes, but looking around for something that's somewhere above "moving away from college" and "expensive plastic storage crate" might be workable. Consider adding dice and dice bags even, because you're trying to bypass the "that's old, I don't need it" and into "that's old, but you can never have too much of that - and it's sort of neat."
Three. There's always a chance that you could trade some inventory that you've got too much of for inventory that you might need. Make up a wishlist and shop around, maybe to even other FLGS', you might be able to make some deals.
Four. If you've got a gaming room, consider starting the discount at a reduced rate and increasing the discount for gamers who are taking advantage of the game room. Then you have customers with added value for coming into the store and spending time there, as long as they aren't all shoplifters you'll probably come out ahead.
Five. ADVERTISE. If game stuff is only a small fragment of your total inventory then make CERTAIN that, unless you're afraid of being burnt down by the J Chick crowd, people KNOW about this massive windfall of goods that are now in the store.