There are free reservations for the opening at Armbrustschützenzelt or Monday nights at Weinzelt.
Additionally, the Löwenbräuzelt is accepting reservations as of now. Interesting slots are not available for new customers, though.
Only today, you can buy Wiesnkini products on Spreadshirt with a 5€ discount.
You can see all the valuable available reservations for Oktoberfest 2018 on our overview page for evening and weekend reservations.