How much should i charge for all these blu rays?

Most used Blu-ray disks sell for about $10, with recent titles or premium versions in great shape commanding a bit higher price. That said, many stores are now selling some new disks of older/less popular movies for $5-$10, so I suggest unless you plan to evaluate each individual title you consider a package price based on about $6-10 each for non-collections and 2-3 times that for collections (depending). Few people will want the whole collection but you may sell it if the total price is attractive enough. The alternative is to sell individually, but that would be lot's of work and risks leaving you with the duds.