Which technology should I use?

Hi,

I have a business requirement. I would like to know which technology should I use that gives the minimum cost.
It's for a burger chain.

Requirement:
1. Create forms that has the available options for the burgers i.e. it pops the list of available burgers. Burger A, Burger B. With cheese or without cheese etc.
I'm planning to use winforms for it and SQL Server for the master data. How much would it cost? Any other technology that I could use? 

2. Store the billing data in the flat files at some specified time interval, from where it will be loaded to SAP.
So, I think first we will need to store this data in some DB and then to the flatfile from when it will be uploaded to SAP. Any other suggestion? 

Please let me know your suggestions. Thanks.

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Kunal G