Raziqsand is a good one. The recipe for the kugane castle walls requires a boatload of gold ingots, each ingot requires a raziqsand, and new houses are coming out in like a weekish so there will soon be some fresh demand. Honestly, just take a screenshot or jot down the names of a few of the crafting mats(the more seals they cost usually means they sell for more) and go check your servers market board to find the best seal -> gil conversion rate.