I agree: Now that standard def DVD is the new medium and I am into Blu-Ray (mostly ordering online at retailers such as Amazon) myself, then I wouldn't have gotten so many standard def adult films on DVD, as it is mostly better to try to save it from the net. But hey to each their own.
However, of course we're all lovers of the industry here, and we all have our favorites (star-wise) and the like, blah blah blah. So I would simply look over the older late '70s and first half of the '80s shot-on-35mm film seminal classics you got (stuff with a younger & thinner Ron Jeremy, Holmes, young Peter North, and of course legendary chicks like a young Seka, Ginger Lynn, Nina Hartley, Sharon Mitchell, ect) and hold onto the rest. And if you truely just wanna get rid of some now not-too-good-at-turning-you-on anymore fluff, then simply throw some in a large junk pile and drive it to a land fill. As far as I know it isn't against the law. When I worked breifly at a motel, truck drivers and single guys would simply leave they're on the road stroke material in the rooms all the time, every few weeks.
If you ever truely wanna get rid of them for cash, just walk into an adult book store, like the LionsDen that I used to live a few miles from, and ask with a smirk but seriously if they accept used and perfectly playable adult films on DVD, and is there a modest fee (however minimum) that the management or employee on staff is willing to accept. I doubt pawn shops (which are mostly rip-offs in my eyes anyway, but if you truely need cash in this rough Economy then I most certianly understand as we all pretty much do) will likely accept them, as virtually no guy or couples looking to spice it up in the sack would go into a pawn shop for high-quality stroke material such as mags and movies. Guess your welcome to try. Just don't get your hopes up.
But alas, if eBay DOES in fact have an adult film section, then that is your best bet. And like glock27 mentioned above, all of the now infamous real film parodies & spoofs should also fetch a decent enough for what it is dollar. The not sexy or even that amusing (to me, anyway) Edward Penishands is definitely one to look over to see if ya got, as well as some of the horror genre spoofs.
I would be willing to also look for Nightmare on Dyke Street as well as the Ron Jeremy starring Texas Dildo Masquarade (Ron says to look for a photo of him and the original Leatherface from Tobe Hooper's film, Mr. Gunner Hansen, somewhere in the film). Plus, there was a made in late in '85 Friday the 13th: A New Beginning (the 5th entry is the series) spoof called something I forgot just now (just check the film referances for it on the IMDB; I'm sure it's there) which has Nina Hartley in it.
I used to own the first Matrix spoof just because of my extreme love for Rebecca Lord and the fact that she is in it, but I've bought online a LOT better stuff with her in it, so I threw it away last summer after I had watched it enough and got my fill. Fairly soon the final DVDs of adult stuff I am ever gonna order is her with Rocco Siffredi in an early apperance in 30 Men for Sandy, which a few online suppliers still keep in stock, as well as her in the Euro-Max first three in the series, because I heard she takes cum in her mouth there (I love the few scenes in which she swallows cum, as it is quite rare most of the time for it, and I have a mild "seeing the alpha-male cum in the ladies mouth is the ultimate finisher" fetish to tell everyone the truth about it). But I myself wouldn't want used porn DVDs.
But alas the best of luck to ya, and to each they're own. Oh and to glock27:
Dude we won't laugh, as the first Crow film with the late/great Brandon Lee was a damn good graphic novel adaption that should have been left well-enough alone, and I've actually heard some overly positive things about the adult film version. Hell, I honestly have fond memories of the first stuff I snuck from under my parents bed in they're bedroom and from they're TV in another room, such as The Poonies (it's pretty much a Goonies spoof) and The Brat, which was where my love for adult films first grew in the very late '80s.