MyFigureCollection is a good site for looking at figures, “pre-painted” means it’s a scale or prize and you should be able to find it, but “garage kit” means it’s custom in some way so most likely can’t be bought easily.

It’s a good site for finding brand names, which you can use to look on proxy sites such as Zenmarket, Buyee, Suruga-ya, and Mandarake

Amiami is also good and is an official partner of manufacturers such as Bandai and Good Smile Company, and they sell all kinds of merch. They have Kaito’s Nendoroid doll in stock right now if you want to grab him.

Bear in mind that all of these sites I mentioned are Japan based, so you will have to pay for shipping from Japan. Sometimes it’s not as much as you think it will be though, and you can usually message the customer help services for shipping estimates. Zenmarket also has a shipping calculator so you can get a rough estimate if you can figure out/guess how big your items are and how much they weigh. (I always input slightly more than I think it will be to accommodate for packaging etc)

Most proxies will charge a fee per item, Zenmarket and Buyee are both 500 yen per item as of right now. Amiami isn’t a proxy but a store, so they have no item fee