Hi,
Glad to hear that you're on the market for sell,
I specialize in this field for several years,
with popularity in ERP&database,
with good quality and pretty competitive price.
Also I has my own professional design skills to meet any of your
requirements.
(I mean that I'm a custom software designer)
My quote for this project(BS model) is starting at $50,000.
In addution,
I provide the standalone version of this project.(only start at $5,000).
I suggest you to use MS office365(sharepoint online + access).
So,
you can use desktop PC, browser and mobile to access your data from anywhere
in the world(China or the U.S.).