Where to buy shipwreck silver?

Hello,

I'm into collecting shipwreck pieces - unaltered, non-jewellery - and I was wondering, which site do you recommend for buying one? I've been buying from VCoins and MA-Shops and kept my eye on Sedwick Coins and NGC-certified coins on eBay. Anywhere else that's good?

I see that there are several websites that specialise in shipwreck artefacts, such as https://www.wreckashore.com/, and most of them seem fine enough (though some of them only sell coin-turned-jewellery things), but I don't know their reputations...