Cheapest priced copy (Double Masters 2022): $0.35 at Card Kingdom, near mint, their price list as of .
Travel Preparations 
Sorcery · Common · Innistrad · #206
Put a +1/+1 counter on each of up to two target creatures.
Flashback {1}{W} (You may cast this card from your graveyard for its flashback cost. Then exile it.)
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
6 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Double Masters 2022 | 162 | Uncommon | $0.35 | $0.49 |
| Innistrad Remastered | 220 | Uncommon | $0.35 | $0.49 |
| Innistrad Remastered | 421 | Uncommon | $0.35 | $0.49 |
| Innistrad | 206 | Common | $0.35 | $0.49 |
| The List | ISD-206 | Common | $0.35 | — |
| Ultimate Masters | 188 | Uncommon | $0.35 | $0.49 |
8 rulings from Wizards of the Coast
- 7 December 2018If Travel Preparations targets two creatures, and one of them is an illegal target by the time Travel Preparations resolves, you'll still put a +1/+1 counter on the other creature.
- 7 December 2018You can't target the same creature twice to put two +1/+1 counters on it.
- 19 March 2021To determine the total cost of a spell, start with the mana cost or alternative cost (such as a flashback cost) you're paying, add any cost increases, then apply any cost reductions. The mana value of the spell is determined only by its mana cost, no matter what the total cost to cast the spell was.
- 19 March 2021If a card with flashback is put into your graveyard during your turn, you can cast it if it's legal to do so before any other player can take any actions.
- 19 March 2021"Flashback [cost]" means "You may cast this card from your graveyard by paying [cost] rather than paying its mana cost" and "If the flashback cost was paid, exile this card instead of putting it anywhere else any time it would leave the stack."
- 19 March 2021You must still follow any timing restrictions and permissions, including those based on the card's type. For instance, you can cast a sorcery using flashback only when you could normally cast a sorcery.
- 19 March 2021A spell cast using flashback will always be exiled afterward, whether it resolves, is countered, or leaves the stack in some other way.
- 19 March 2021You can cast a spell using flashback even if it was somehow put into your graveyard without having been cast.