While costs will vary depending on your individual business and the accountant you've hired, here are a few tips that can help you keep your costs down.
Keep records as automated as possible. This makes it easier for the accountant to access the information.
Keep records as clean and clear as possible. If it is difficult for the accountant to decipher ledgers, it just means more time for them and more money out of your pocket.
Do your homework. Do what you can as you can to get all of the simple paperwork out of the way on your own, especially in the case of an audit, which can be costly.
Hire temps. If you need someone to only take care of running the books, you may want to consider hiring temporary help. This is cheaper than going to a CPA for basic bookkeeping.