Sometimes I go months without buying any, sometimes I buy a lot on a short period of time, sometimes it's somewhere in between. It depends on if I see something I really want to try or is a good deal, or just strikes my fancy. I hadn't bought any beer since Christmas, but this week I picked up a 6 of SN Glissade and a case (plus 3 bottles) of Duvel.
Hope you don't mind that I added one more choice to your poll.