Defensive Equipment

Helmets

Hide Cap: Buy 0 Sell 25 Defense 3

Bronze Helmet: Buy 200 Sell 100 Defense 8

Iron Helmet: Buy 500 Sell 250 Defense 14

Beret: Buy 700 Sell 350 Defense 17

Gold Helmet: Buy 0 Sell 600 Defense 18

Rock Helmet: Buy 0 Sell 1000 Defense 20

Cera Topper: Buy 0 Sell 1250 Defense 23

Glow Helmet: Buy 2300 Sell 1150 Defense 25

Lode Helmet: Buy 6500 Sell 3250 Defense 29

Aeon Helmet: Buy 7800 Sell 3900 Defense 33

Prism Helmet: Buy 0 Sell 400 Defense 40

Doom Helmet: Buy 0 Sell 4750 Defense 29

Dark Helmet: Buy 0 Sell 6000 Defense 35

Gloom Helmet: Buy 0 Sell 6500 Defense 42

Taban Helmet: Buy 0 Sell 0 Defense 24

Sight Cap: Buy 0 Sell 10000 Defense 30

Memory Cap: Buy 0 Sell 10000 Defense 30

Time Hat: Buy 0 Sell 15000 Defense 36

Vigil Hat: Buy 0 Sell 25000 Defense 45

Ozzie Pants: Buy 0 Sell 0 Defense 35

Haste Helmet: Buy 0 Sell 6000 Defense 35

Rainbow Helmet: Buy 0 Sell 8000 Defense 35

Mermaid Cap: Buy 0 Sell 8000 Defense 35

Armors

Hide Tunic: Buy 0 Sell 40 Defense 5

Karate Gi: Buy 300 Sell 150 Defense 10

Bronze Mail: Buy 520 Sell 260 Defense 16

Maiden Suit: Buy 0 Sell 280 Defense 18

Iron Suit: Buy 800 Sell 400 Defense 25

Titan Vest: Buy 1200 Sell 600 Defense 32

Gold Suit: Buy 1300 Sell 650 Defense 39

Ruby Vest: Buy 0 Sell 1800 Defense 45

Dark Mail: Buy 0 Sell 1900 Defense 45

Mist Robe: Buy 0 Sell 3400 Defense 54

Meso Mail: Buy 0 Sell 3000 Defense 52

Lumin Robe: Buy 6500 Sell 3250 Defense 63

Flash Mail: Buy 8500 Sell 4250 Defense 64

Lode Vest: Buy 8500 Sell 4250 Defense 71

Aeon Suit: Buy 9000 Sell 4500 Defense 75

Zodiac Cape: Buy 0 Sell 5000 Defense 80

Nova Armor: Buy 0 Sell 5500 Defense 82

Prism Dress: Buy 0 Sell 4400 Defense 99

Moon Armor: Buy 0 Sell 6500 Defense 85

Ruby Armor: Buy 0 Sell 7000 Defense 78

Raven Armor: Buy 0 Sell 7900 Defense 76

Gloom Cape: Buy 0 Sell 8200 Defense 84

White Mail: Buy 0 Sell 4100 Defense 70

Black Mail: Buy 0 Sell 4100 Defense 70

Blue Mail: Buy 0 Sell 4100 Defense 70

Red Mail: Buy 0 Sell 4100 Defense 70

White Vest: Buy 0 Sell 2900 Defense 45

Black Vest: Buy 0 Sell 2900 Defense 45

Blue Vest: Buy 0 Sell 2900 Defense 45

Red Vest: Buy 0 Sell 2900 Defense 45

Taban Vest: Buy 0 Sell 0 Defens 33

Taban Suit: Buy 0 Sell 0 Defense 79

Source of Chrono Trigger Player Guide