Depends on your size. If you have multiple stores and employees you rebid your workers comp insurance, store insurance, liability insurance and try to negotiate with the landlord to reduce your rents. You beat up on your advertising salesman for a few points.
If you are a one man show then you get a car with minimal payments, that gets 50 mpg that looks nice and put logos on it, print business cards and a cell phone and call it good. Your total investment in tools is less than $200.
I like having a GPS, cell phone, organizer, car charger for same. Then a 1 Tb external drive with my software tools, laptop and jewel tool set for working on notebooks and drives. Nearly every software tool is free. If you cannot work from home then find an accountant or insurance agent with his own office and offer to rent one of his offices with utilities/INTERNET for $100 a month or whatever that area supports. He will likely love to save some money sub-renting an unused office to you.
I probably have a larger investment in my logo design, shirts, graphic on the car, business cards, invoices and thank you cards.
I do not use insurance, phone services, bookkeepers, lawyers, accountants nor anything else. As you grow you will get too busy to do everything so you start to farm out things to give you more time.
While channel surfing to see what was on we came across a show called extreme cheapskates which was about people doing crazy things to save money.
So I guess was curious what you guys do to save money with your business operations?