Not a PVPer but need Training Certificate for guild..Buy from other players?

[Massandra]

I'll be straightforward, I dislike PVP in mmorpgs but on Blade and Soul its required in order to get either the Zen Bean or the Hongmoon Pellet from guild crafting in order to unlock the last tier for your LMB skill, which means its near impossible for me to obtain. Would my only other choice be to trust and buy from another player by inviting them into the guild?

I do have 1 out of 3 required to make the pellet but I just simply can't do pvp due to my living situation because I live in a shared household where there's always someone streaming movies which can make my ping unpredictable going from an average of 120ms up to 600+ at random moments every minute.

 

How much would they usually go for in the Mushin Server?