Honey Syrups are common FP recovery items in Paper Mario.
Sweet honey syrup. Restores 5 FP.
Four shops across the Mushroom Kingdom sell Honey Syrups. The Shroom Grocery sells them for 10 coins, the Koopa's Shop sells them for 8 coins, Little Mouser's Shop sells them for 5 coins and Yoshi's Cabana sells them for 6 coins.
Honey Syrup sells for 3 coins in all shops.