i just came up with a purchasing procedure as following:
1. one of us collects all of the everyone's purchasing lists and ask all supermarkets and shops for the best prices. we'll give the order to the supermaket or something which gives us the lowest prices.
2. we hire a large vehcle to carry all the stuff to a place somewhere in downtown.
3. everyone go gets what he/she ordered on a determined weekend day
the more people in, the cheaper stuff we'll get
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