How much is a storage unit by you?

I rent a big 2 stall garage for $600 a year. ($25/stall/month)
It's probably at least 30x30 with easy room for 2 cars and parts storage. It is insulated as well. Electric lights and a few outlets. Electric is included in the rent but I don't abuse that. May be plug in a battery charger for a couple days but that's about it.