Where can I rent a one room office for my business?

There are many Serviced Offices all over the world. Regus would be one but don't take that as a recommendation. There are also companies that may be willing to rent you a spare desk or room more locally. Ask around.

a church would not be a good place ; try looking online for either office space for rent or storage units, which should be much less

Regis or HQ centers

I am looking to rent a room to store my inventory as well as my shipping supplies. I don't want anything expensive. All I need is one room. I thought about asking a church. Thoughts?