The update has been out long enough that I think that some of us have an idea of how much these are roughly now... I however have no idea how much they are worth and I want to buy a bunch at a little more than would be expected but I don't know how much is expected. Having a rough idea of how much they are worth might also get more people chasing them, I think I will probably have to find a couple of vendors because I am going to need a lot of them.
Most shops are around 3k-3500r standard, but depending on who you find you could possibly get a bulk deal. I did an auction earlier this month, and it didn't go too well lol-- https://empireminecraft.com/threads/auction-stack-of-sea-hearts.86348/ So it really just depends. I could potentially work out a deal for you with someone else depending on how many you need, PM me