There is AFI in Jessup
http://www.afipowdercoating.com/
Color matching powder is harder than paint (i.e. near impossible) so I wouldn't fault anyone for that. The only way to guarantee it is to buy enough of one batch to do everything (and probably even need to mix containers if doing that.) AFAIK, the color shifts w/ baking parameters too so its going to be hard to match even then.