Some of the arcanes I have to offer and price of each. All arcanes are maxed rank:
Arcane Energize - 1.5k
Arcane Grace - 800
Arcane Barrier - 500
Arcane Guardian - 400
Arcane Avenger - 400
Arcane Aegis - 400
Arcane Strike - 200
These are some quick examples and are at the advertised rate of 1:1 FG to Platinum. Feel free to DM a list of anything you're looking for in the game and I can tell you if I have a spare to sell you at the median market price.