The card "Nitro Synchron" comes in The Duelist GenesisBooster Packs.
Formula Synchron is a rare card in Starstrike Blast.
"Road Synchron" comes in the Starter Deck, 5D's Starter Deck 2009.
You can find it in the Yusei's grey stardust deck
30
In some booster packs.
A typical box of trading card game booster packs contains around 36 packs.
you find it in booster packs or tins you may not be lucky for the booster packs though
36 packs
A draft booster box typically contains 36 packs.
A set booster box typically includes 30 packs.
An MTG booster box typically contains 36 packs.
$4.99 for one booster pack