Due to the world generator plugin, a beach biome is close to impossible to find. This means buried treasure cannot be found anywhere in the world. Seeing as the only way to obtain Hearts of The Sea, which will make conduits, is through finding buried treasure, I am suggesting to add Hearts of The Sea to the shop. Maybe turtle items as well, seeing as they also spawn on beaches only. Thank you for your time and consideration!
If beach biomes are has rare or impossible as you say I think this would be a good addition added to the shop.