I need roughly 6k of them, and I can pay in pure. Hoping to buy for 3k/crystal.

please ping me if you're selling.

I've got over 6000 of them I could sell you. Would you be wanting me to send you each of them or just buy an item from the shop for you...?

I would prefer to have the crystals and buy the items myself, if possible.

Are there any quick/easy ways to transfer such a large number of items?

trades.

I meant, is there any easier way than making 600 separate lots. Because if not, well... The time it'd take to do that many trades isn't worth the sP I'd be getting, personally.

no.

if you price in shop at the price you want to sell, the buyer can spam refresh on the buying page, after the first purchase in the shop to mass buy. You'll have to turn them in every 100/250 depending on GA or not because of inventory limits, but it should take literally just minutes if you're not arthritic in the fingers :P