Buy a home vac sealer, there are good deals to be had on online auction sites. Seal in portions that you would use over 3 days once opened.
Experiment with keeping the sealed portions in a dark cool cupboard, fridge , freezer and see what works best for you in the cup. There is plenty of good info on the webs / other forums on freezing beans. Don't get caught up on " noise " around these subjects, simply experiment and decide what works best for you.
Most important with any fridge / freezer storage is to let the beans sit unopened at room temp for 24hrs. EDIT: after removal from fridge / freezer prior to use and never refreeze.