Here you go - http://www.gopositive.com/
They have POS which will also work online, from a common inventory.
Through the 1990's I sold their POS software as a reseller and attended sales meetings and seminars with them. Good bunch of people, unpretentious from a college town in eastern Washington state.
Good value for the money and will do whatever it takes to make things right.
I sold and installed several dozen of their programs throughout several states and had happy customers. Can't recommend them too highly.