Either player can pay 800 Life Points to negate the Special Summon of a monster(s), and/or an effect that Special Summons a monster(s) and destroy those cards.
Near Mint Unlimited - $14.25
Lightly Played Unlimited - $13.00
Moderately Played Unlimited - $11.50
Heavily Played Unlimited - $9.25
Damaged Unlimited - $8.00