Chips can be bought at any place like Home Depot. i get mine at Lowe's. Some guys on here make their own.
Either way, investing in one is money well spent and before long you will associate the smell of smoke to deer season.
I get my hickory chips from Lowes or Menards or somewhere like that, I got my smoker from the link that Jesse posted up. Right here in Ohio, so I got it within a couple days.