Data mining and scheduled update

I am in the first phase to define a project for on-line selling Italian wine on the Singapore market. I need to:

- make a list of all the on-line websites available that sell wine in Singapore;
- extract from these websites the data relating only the Italian wines they sell, such as the name, year and price;
- extract general information on shipping prices, timing of delivery
- if possible, understand the sales volume for these products
- after this first preliminary research, regularly check all these sites for updates on new wines and prices