Official Prices have been added in-game to items. The price will appear in trade at the bottom corners saying its wealth amount. You can price check your items by trading players, as well as use those prices to base your items wealth and buy/sell prices.  The items listed below have had there price added in-game:

SPECIAL THANKS TO ADMINS:  AMPLIFY AND JASON

Annihilation- 450m | oblivion- 450m | Decimation 450m | Zammy Spear- 150m | Red castlewars cape- 10m | Zamorak (rune) 25m per piece  
Bandos Chestplate- 200m | Bandos Tassets- 200m | Bandos boots 7.5m | Bandos (rune) 25m per piece 
Torva platebody 1b | Torva platelegs 1b | Torva helmet 800m | Zaryte 550m | Ancient (rune) 25m per piece 
Divine Spiritshield 600m | Elysian Spiritshield 500m | Arcane Spiritshield 450m | Spectral Spiritshield 400m | Spirit shield 200m 
Dfh- 50m | DFS- 150m | Saradomin sword- 80m | Saradomin Godsword- 175m
D Claws- 600m | Statius Platebody- 150m | Stat legs- 150m | Stat helm-100m | Vesta top-175m | vesta legs- 175m | Morrigans Top- 145m | Morrigans coif- 85m | Morrigans Legs- 140m 
Zuriel Body- 130m | Zuriel Legs- 130m | Zuriel hood- 85m | Zuriel staff 95m | Vesta Long- 195m | statius Warhammer- 190m 
Armadyl Top- 200m | Armadyl legs-200m | Armadyl Helm- 175m | Armadyl (rune)- 25m per piece | Armadyl godsword- 650m 
Primal Rapier- 500m | Primal Maul- 450m | Primal 2h- 500m | Primal Longsword- 500m | Primal Top- 500m | Primal Legs- 500m | Primal Helm- 450m | Primal Kiteshield- 400m

 Primal Gauntlets- 100m | Primal Boots- 150m 
Choatic Rapier- 250m | Chaotic Maul- 200m | Chaotic Crossbow- 250m | Chaotic Staff- 200, |  Chaotic Longsword- 250m 
Stat ring- 2b|Energy  Sword- 2b