Continuing my pages with manufacturer links, this one is all of the folks who make Early Imperial Romans. As always, if you know of some that I missed, please leave me a comment and I will add them in.
Black Tree Designs
Crusader Miniatures (Mostly Republican but light and command would work for EIR)
Gorgon Studios (Command models)
Imago Militis (Sold through North Star)
Renegade Miniatures (Republican but Velites might be appropriate)
Tin Soldier UK
Wargames Factory (Cavalry)
Green - I've bought this/done business with them and it was positive.
Red - I've bought this/done business with them and it was negative.
Black - I'm interested but have not done business with them, yet.
(Essex and Tin Soldier added thanks to BigRedBat.)