go on ebay and search "buddyfight deck"

I'm bushiroad /magic madhouse / eBay /Amazon

BUGNCOLLECTABLES (kinda overpriced in my opinion)

Amazon was the best shipping time and quality for me.

Almost has all decks and starter packs specially “X” series, you might not find all the old ones, but there is a lot

Amazon or ebay

Tradecardsonline.com