Each stall comes with 2 bags of shavings, you may purchase additional bags after you have selected your stall and hit checkout. There will be a spot at the Expo center to pickup additional bags purchased.
Select your stall and the amount of days you will attend, additional days may also be purchased later at: Extra Day
If you would just like to purchase shavings, additional bags can be purchased here: Stand-Alone Link to purchase Shavings