Replying to Quick assignment help, +k

im trying to find some sort website or book or something that tracks prices of goods on a month-to-month basis, or even day-to-day.

for example, i would like the prices of milk for the months of october/november/december. but it doesnt have to be milk, any product would be fine. if somebody knows of a place where i could find the history of prices for shit for the past few months, please post a link or where i can find it.
+k for any help with this matter. i will also owe you a favor. if i had money i would payapl you some. maybe i could just give you an I.O.U. and paypal you $5 or send you a hat or something sometime in the future.