I've added ACCOUNTS to my list of 8 Free and Low Cost Accounting Software Options for Nonprofit Organizations, and from now until January 31, 2013, ACCOUNTS is having a half price sale. The software normally costs $120-$200 per year, but right now it can be downloaded for $60-$100, and it has a 60 day free trial (remember that you don't have 60 days to try it if you want the discount).
ACCOUNTS is relatively simple accounting software that efficiently handles bookkeeping for small to medium non-profits. To get more details on features, check out the first software listed in my nonprofit accounting software article. Other titles covered are Aplos, Zoho Books, Big E-Z, FastFund Accounting Standard, Quickbooks Nonprofit and Online Essentials, and the free GnuCash.