P.R.
Hi E.,
You can check www.bn.com (Barnes & Noble) to find the UPC and ISBN numbers of these DVDs, to find the right one. Ask the library for these #s before you buy.
If you want to buy used, the best resource I've found so far is www.swapadvd.com, where you can buy any gently-used title for $5 (some are readily available, others you wait in line to get); if you have any old DVDs you can post them on your swapadvd account and if another member requests it, you print out the wrapper with postage and mail it to them (it dcosts about $2), and you get 1 credit to order any DVD in return. Couldn't be any easier! Please give my nickname "gadgetgirl" as your referral.
<a href="http://www.swapadvd.com/index.php?n=2">Swap, Trade or Exchange DVDs for Free! - SwapaDVD.com</a>
The Muppet Movie is very hard to get used. You're better off buying it new - there are several editions of this DVD. Gobling King is wait listed. Scooby Doo is available fullscreen or widescreen and can be ordered on swapadvd. If you order from swapadvd, keep in mind that they may be ex-rentals or the case might not be in perfect condition - the only requirement to swap is that the DVD be in good condition, playable, not pirated, and with original artwork. The library may ask for new copies.