LEE filter system + CPL ????

I am using the Lee filter system for my landscape shots but i still need a CPL to boost those colors accordingly. In this respect i know that LEE makes a CPL that can be mounted on the holder but the cost of the filter + the respective adaptor to do so is just ridiculous IMO. So, i am in the market for a 82mm CPL of decent quality but without going bankrupt. Only limitation is that it must/will be used with the LEE holder screwed on to it.

Much appreciated any suggestions/proposals on the matter especially from anyone currently using such a setup.

Thank you in advance.