The concept of "best trading expensive" can vary depending on the context, such as trading cards, in-game items, or pets. Here are some examples of high-value trades across different platforms:

*Trading Cards:*

- *Most Expensive Sports Cards:*

- *1952 Topps Mickey Mantle*: Sold for $12.6 million, considered one of the rarest and most valuable baseball cards.

- *1909 Sweet Caporal T206 Honus Wagner*: Sold for $7.25 million, highly sought after due to its rarity and historical significance.

*In-Game Items (Roblox):*

- *Blox Fruits:*

- *Kitsune*: Valued at 110 million, highly sought after for its grinding and PvP potential.

- *Leopard*: Valued at 40 million, considered one of the best fruits in the game for its high damage and mobility.

- *Fisch:*

- *Nessie*: Valued at 200-700 Enchant Relics, highly sought after due to its rarity.

- *Phantom Megladon*: Valued at 45-80 Enchant Relics, considered a valuable fish in the game.

- *Grow A Garden:*

- *Disco Bee*: Valued at 1 trillion Sheckles+, highly sought after for its rarity and utility.

- *Queen Bee*: Valued at 1 trillion Sheckles+, considered one of the most valuable pets in the game.¹ ² ³

*Other Platforms:*

- *Creatures of Sonaria:*

- *Etherealotus*: Highly valued for its defensive abilities and unique features.

- *Verza*: Sought after for its speed and attack capabilities.

- *Grow A Garden (Pets):*

- *Disco Bee*: Valued at 30-80M ¢, highly sought after for its rarity.

- *Blood Owl*: Valued at 40-80M ¢, considered a valuable pet due to its abilities.⁴ ⁵

Keep in mind that trading values can fluctuate based on demand, rarity, and other factors. These values are subject to change and might not reflect the current market.