Custom Pricing Per Item Per Customer?

I am using 1.3.9h. with cherry zen as my template. I tried using Group Pricing for a site I am working on hoping it would do what I need. Unfortunately, not.

I have a client who needs their customers to be able to have special pricing per item. Unfortunately, my client did not agree to a common amount below his cost, he negotiated each product one at a time. Therefore, Group Pricing does not work for me because it allows a common below cost across the board per customer. He carries inventory of approximately 100 products, all of which are not available to all customers.

Is there a module that would allow me to specify very specific pricing for each item for each customer after they login?

For example
Product B2012 cost is $100
Mr. Jones pays $150.00

Product B2013 cost is also $100
Mr. Jones (same customer) pays $125.00

Any suggestions would be appreciated. Thank you.