Trade-In is a Normal Spell Card.
Spell Cards are usually activated from the hand on your turn unless their type gives another timing window.
On the current TCG and OCG Forbidden & Limited lists tracked here, Trade-In is Unlimited.
YGOPRODeck lists Trade-In for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Trade-In appears in 2-Player Starter Set (STAX-EN008) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Trade-In is about $0.09 on TCGPlayer (prices change frequently).
