POC - Excle like web application

I am trying to add another complex module to my .net application and I need help from somebody to develop this as a 'proof of concept' with general data and functionality. This has to be working demo, using [ASP.NET][1] (3.5 or above), SQLServer_2008 & MS Excel & VBA (2007 or latest version). We are trying to show a MS excel spreadsheet like webpage for users to enter data, do some validations and calculations and save it to DB. We have pricing module, which has dynamic (60 to 100 columns (nested, depends on a user parameter) and any number of rows. There is main, sub, sub-sub set of columns grouped together on both horizontal and vertical axis. I am looking for somebody to develop a small app and the related database tables and send the code for testing to prove the concept. If you do a good job at resonable price, you will have bigger business from us.