hide -boots, gloves, shield (most popular: Swedish Short-Snout skin)

blood -there are 12 uses for it, discovered by Albus Dumbledore

liver -potions and some sports (17 sickles an ounce in Diagon Alley)

heart (heartstring) -wands

horn (powdered) -potions, wands... (Romanian Longhorn horns are Class B Tradeable material)

eggs -potion ingredients (Class A Non-Tradeable Good. Chinese Fireball eggshells are highly prized as potion ingredients.)

dung -fertilizer (in Herbology, for sale by the barrel in Knockturn Alley)