Continuing development of IIS / MSSQL Sites

I have several Microsoft-based websites that needs to have ongoing maintenance on those sites. On one website, I have a Google Maps-based Store Locator that is not working that needs to be repaired. I also have another website where it needs to have fields added so that we can collect more data and to store/retrieve that information from the SQL database. Please quote a good rate considering that this is ongoing work.