I was browsing through the pages of this part of the board and noticed most of the popular threads include figma, revoltech, macross, gundam etc. To buy most of this stuff out here is expensive, in most cases its still cheaper to buy it online and pay shipping than it is to buy from a brick and mortar store, providing you can find one that actually sells this stuff.

If you know any good sites for collectables, anime, gunpla etc post them below with a brief description.

Ami Ami
Probably the cheapest site when it comes to most japanese collecables. Beware they don't take kindly to pre order cancellations, and to my knowledge there is no way to estimate shipping.

HLJ
A little more pricey compared to ami ami, a good choice for stuff ami ami is sold out of.

Mandarake
Sells stuff that is "second hand" Every thing I've bought from them has still been MISB with maybe a scuff mark on the packaging. If you cant find what your looking for try putting it through a translator and pasting the Japanese text into the search bar. Also orders under 5000 yen incur a 500 yen handling fee.

Other sites of note include

Angolz
Plamoya
Anime-Export
Hobby Search
Toy Wave
Big Bad Toy Store
Corner Store Comics