A few months ago I picked up an Ah! My Goddess dvd at a thrift shop for three bucks. Inside I found an extra dvd - one of the old Sailor Moon dub-only discs. I can't forgive them for what they did to Haruka and Michiru, but that dub was a great big chunk of my childhood, and these dvds are kind of rare and expensive nowadays. It was an epic nostalgia bomb!
Oh man, I bought and resold some of those not too long ago and made a lot of money. Those out of print anime dvds are $$$.