What do cinemas do with the movie posters they no longer display?

do they keep them in storage for a while or throw them out straight away? not just the posters but cardboard cut-outs too.
oh, and would they be willing to either give away or sell these old ones to someone? if so, who would i need to ask in the cinema about getting one?

Depends on which cinema chain. Depends on the distribution company.

I used to manage cinemas and some distribution companies would ask for them to be returned before they would allow that cinema to have the film. This was the case for certain Star Wars Episode 1 and LOTR:TFOTR posters. The cinema would get a large fine for not returning them.

What is left is usually given out to the staff or should a customer ask and they have anything left then maybe they would get one.

Go along to your local multiplex and ask!!!

If you don't ask you don't get!