I'm with a small university that has a mail order operation that ships about 5 orders a day. Most of the orders come in by phone. It sells retail and wholesale. Some customers buy on terms and receivables need to be tracked.

80% of the orders ship by media mail and some are shipped internationally.

I've looked at a variety of mail order software packages and they are all too complicated for such a small operation. The wholesale version of QuickBooks would probably work but I want software where the backend data is available for reading and writing.