Cheapest priced copy (Dominaria Remastered): $0.69 at Card Kingdom, near mint, their price list as of .
Chain Lightning 
Sorcery · Common · Mystery Booster 2 · #55
Chain Lightning deals 3 damage to any target. Then that player or that permanent's controller may pay {R}{R}. If the player does, they may copy this spell and may choose a new target for that copy.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
12 printings · $0.69 to $34.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Battlebond | 171 | Uncommon | $0.79 | $2.49 |
| Dominaria Remastered | 113 | Common | $0.69 | $0.79 |
| Dominaria Remastered | 316 | Common | $0.79 | $2.49 |
| Eternal Masters | 123 | Uncommon | $0.99 | $0.99 |
| Jumpstart | 302 | Uncommon | $0.69 | — |
| Legends | 137 | Common | $13.99 | — |
| Mystery Booster 2 | 55 | Common | $0.79 | — |
| Amonkhet Invocations | 26 | Special | — | $34.99 |
| Premium Deck Series: Fire and Lightning | 16 | Common | — | $1.79 |
| Secret Lair Drop | 370 | Rare | $17.99 | $21.99 |
| Secret Lair Drop | 2047 | Rare | $6.49 | $6.99 |
| Secret Lair Drop | 2052 | Rare | — | $8.99 |
4 rulings from Wizards of the Coast
- 8 December 2022The copy of Chain Lightning is created on the stack, so it's not cast. Abilities that trigger when a player casts a spell won't trigger. Players may respond to that spell before it resolves.
- 8 December 2022The player putting the copy of the spell on the stack controls that copy.
- 8 December 2022As Chain Lightning resolves, either the original or one of the copies, the targeted player or the controller of the targeted permanent may copy it. The copy has the same text, target, and color as the resolving spell, though the player creating the copy may choose a new target for it. Once that copy is created (or not), the Chain Lightning finishes resolving and leaves the stack.
- 8 December 2022If the targeted player or permanent is an illegal target as Chain Lightning tries to resolve, the spell doesn't resolve and none of its effects happen. It can't be copied.