I will give you this hope. There is license turn over at the minute where a good few early 2000's anime and later are being picked up. patience in this case is a great virtue. Add to that if importing is an option then Australian and US markets are worth a look.
OOP is pricey so set your spending higher, but not too high (mine is £120 at an absolute for truely rare sets and half that for a film and even then...). In rare trades you can't be as picky, but always have the nerve to ask the seller what they'll take.