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 - $15.05
Lightly Played Unlimited - $14.30
Moderately Played Unlimited - $12.80
Heavily Played Unlimited - $11.30
Damaged Unlimited - $9.80