I would be interested. When I’ve purchased used CDs or DVDs they’ve been sent in yellow padded envelopes, via “media mail” (if that option still exists).
Media Mail is likely going to be the best way to move them.
According to this page, DVDs are on the approved Media Mail list.
It probably wouldn’t kill you to print that page and bring it with you since not everyone knows everything. Maybe even toss it in the box since I understand Media Mail boxes can get inspected from time to time to make sure people are actually shipping media (since it’s so cheap).
You’re a prime candidate for both Amazon Video (start by subscribing to Prime to get many options free), Netflix streaming, and - to replace your disc-buying - Vudu. Much cheaper and no problem of what to do with watched-once stuff.
(I’m always after HD-DVD titles, should anyone reading this have a collection.)
I just upgraded some of my Bond collection to Blu-ray.
If anyone’s interested in regular DVDs of Dr No, From Russia w/Love, Goldfinger (special ed) and/or Thunderball (2 disc ult ed), send me a pm. I’ll be happy to send one or all to you.
A friend of mine claims he buys bundles of DVDs (6-12?) at a time thru eBay; watches the ones he wants, then rebundles most and re-sells them. I don’t have much more detail, but he claims his cost per watched DVD is very little. Sounds like it might work for you.
I’ve considered doing the same thing through craigslist, you can get good deals when people sell their entire collection. Usually they go for ~$1 a DVD if you buy an entire collection (which can span 20-200 movies usually). Watch what you want and sell the rest (preferably individually so you can get more revenue).
I moved to a city with a great library system, so I don’t need to do that though.