Limiting Number of Contributions

We are currently selling pieces of an art installation by a local artist. The money for the pieces are considered contributions to a fund. We would like to set up a public-facing TNEW page to sell the pieces, but since we treat the money as a contribution, we won't be able to keep track of our stock, and feel we run the risk of over-selling before we even know we've sold out.

Does anyone know of a creative way to put a cap on the number of contributions that come in via specific channels? Or can you think of another way to address this need that perhaps I'm not seeing?

Thanks all,

Mike Dorsey

CRM Specialist

National WWI Museum and Memorial