The major manufacturers for mini armour are all located in the far east. The most popular lines are Dragon Cando, Takara World Tank Museum, Trumpeter, Popy Projekt Panzer and Konami. Only the Dragon Cando line and Trumpeter(Pegasus) is distributed in North America, all others must be imported from Japan and Hong Kong.
Each manufacturer has a particular niche format and quality varies amongst them:
Dragon Cando - normally releases series of 7 tanks including a special version.
Takara WTM - produces a larger release of 18-22 tanks including a hidden version which is not listed on the box. Also produces 1/144 scale remote control tanks too.
Popy Projekt Panzer - primarily distributes experimental versions of WW2 tanks. Its special versions are the most rare of any series.
Trumpeter - focus has been on tanks and halftracks that have not been mass produced by the major manufacturers thus far. No special versions.
Konami - niche centered on JDSDF armour. Special versions include division logos.
Cando, Konami, Trumpeter and WTM have produced modern tanks at this point in time.
In addition, custom manufacturers such as Metal Troops and CGD also provide armour and accessories for the above scale. Custom resin kits from Japan, complete any ommissions for non mass produced items.