I assume by asking for a cover that you intend to leave the stroller outside. Be very careful as there have been cases reported on the forum of strollers being stolen from yards including a gated side yard. Let's face it they are in demand and a quick $300 and up income to the stealer.

I'm lucky mine goes in the garage but if you can put it in a shed in the back yard that is locked that would be the best. There are even bins meant for garbage cans that it might fit into that are lockable.