I doubt you can do this for free, or at least not well. However, if you can manage to automate your order-entry process without losing control of your business to the programmers, you might realize considerable labor savings. The general steps might be something like this:

1. Convert the Excel spreadsheets to a database such as MySQL. The program is free, the clerical work is not.

2. Create a server-side active web page using PHP or perl to read the database and present choices to the user in HTML form. Again, the programs are free, but the programming work is not. It is not very difficult for an experienced web programmer.

3. Create an order-entry system. There are some “storefront” web packages available, some for free. Again, the programming will not be free. This is the part that many first-time web entrepreneurs ***** up. If your web site looks silly and doesn’t work well, your customers will attribute these shortcomings to your business. Do this part right.

4. Test, very thoroughly, every possible thing that a user might do.

5. Go live.