One of my favorites has always been the Last Cavalry shop. The owner, Dave Youngquist, offers a good selection, but it's his sense of customer service and support that keep me coming back to shop with them. 

http://www.lastcavalry.com/

Fantization is good for fantasy type stuff- mostly 32mm gaming figures but they do carry larger ones as well. 

https://www.fantization.com/

Thank you both for the info. I will give them a try.  

Knox, El Greco miniatures in the UK is a great place to order from. 
-Gerald 

I've purchased most of mine from random sellers on eBay. It's a bit more convoluted to actually find 'rare' items, but I think it is one of the most convinient. Especially with the rise of 3D printing, there are a number of companies in Taiwan and China that are using 3D modelling software to print items to mold from, and the results can be shockingly good. I've got a Trump and a Putin from one of these guys, and the faces are startlingly accurate. 

Andrea Miniatures and Pilipili Miniatures are great companies that sell top quality figures and busts in different scales and in a multitude of genres. If you're looking for WWII in 1/35 scale then I suggest Alpine Miniatures. Warriors is another one but they have mostly gone the way of Verlinden Productions. I hope this helps.