Rookgaard items that are transferrable to Mainland-
Oracle Figurine- You can buy at NPC Raffael on the Island of Destiny for 100 gps
Steel Axe- Purchased at NPC Raffael for 500 gps or if you pick Knight as a vocation in Island of Destiny
Wooden Sword- No longer obtainable but from The Rookie Guard quest mission 1 if you have an older character the player might be logged at this Tutorial Island. (Source)
All of these items are from The Rookie Guard quest:
Sack of Herbs
Book of Orc Language
Small Health Potion- Reward from The Rookie Guard Quest, Small Health Potion Quest or you can buy this from NPC: Hyacinth, Lily - Rookgaard Hamish - Dawnport for 20gp)
Small Lamp- Every server save on Dawnport in Mr Morris Room, probably need KEY 0010 from Dawnport Quest
but I know that it is now also available on mainland too. Unfortunately, I wasn't sure where exactly, I was thinking about the Asura's or Carlin Castle (but the door is closed) but I didn't know the exact location, look Loreffy response. This item is worth noting.
Copper Key 4601- For the Bear Room quest) "Can be found in a Chest near the Bear Room after revealing a hole with a Pick."
Silver Key 4603- For the Katana Quest) "Can be found at end of the "Corpse Alley" inside one of the bodies."