oem style or just oem?
regular oem basically just means 'replacement parts' and you can pretty much find these shops all over the web.
using google and searching for "toyota parts" i came up with a ton of listings of which a few were:
they're everwhere and quite easy to find, just do a search and you'll see
for oem STYLE aftermarket parts (parts that keep the factory styling...but are usually lighter, provide more peformance, etc.) you can find these at many autosport shops across the web. intensepower.com, titanmotorsports.com, mvpmotorsports.com offer a few selections of oem styled (mostly exterior) parts.
hope this helped