Turnips / The Stalk Market.Edit
Turnips can be bought from Joan who wanders around your town from 6AM - 12PM on Sundays only. Turnips are bought in bunches of ten and prices for these bunches vary from 90 - 110 Bells.
It should be noted that Joan is one of the few Animal Crossing vendors who will sell to you even if you do not have room for the item in your pockets. If you buy more than you can carry she will take the bells but you will not receive the items that cannot fit.
Storing Turnips / Turnip SpoilingEdit
Turnips can be stored like any other item (personal storage, lockers etc.), but, turnips will spoil on 6AM on the next Sunday a week after you bought them. ANY instance of time travel will spoil any turnips in your possesion, and in all storage, so be VERY careful.
Turnips are sold at Re-Tail, where you can ask Reese what they are buying them for on that day. Prices for them vary hugely eg. 60 - 250 Bells per turnip. Of course, if you bought 100 turnips for 10,000 Bells, don't sell them for anything lower than 101 bells a turnip. You cannot sell turnips on Sunday, and can sell them up to when Re-Tail closes on Saturday night.