In general, expect to spend over 1 million kinah to reach level 199 in a tradeskill. In general, expect to spend 3 million to 5 million kinah to reach level 399 in a tradeskill. If you level Armorsmithing slowly, expect to spend upwards of 8 million to 9 million kinah to reach 399.
Rockeh provided some great, general numbers for costs per tradeskill here: Leveling Crafting by Work Orders. Crafting 300-399 took me 336 work orders and cost over 2.4 million kinah, so well over 7,300 kinah per work order. For a detailed examination of skill 300-399 leveling, go here: 300-399 Armorsmithing: Details on XP, Kinah, Time, Rewards, Etc.. more.
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