Dear Sir,
I am a specialized statistician analyst and R programmer, I am interested in your project and It will be a pleasure to work with you on it.
I understand that you want to use the arules R package in order to compute and analyse possible associations between the supermarket data items, and you a re surely wondering how to get an idea of what people buy at the same time, in a nutshell if a person buys item A which other item(s) she would want to by.
To do this we have to calculate possible associations confidence and lift by using arules functions like apriori and analyse different results according to the support and confidence used. I sew your R program and the report, it is interesting and i will be happy to help you doing the work on your data.
Best regards.
Remark: my price is a welcoming one.