FOX, King, Radflo, Swayaway.
Depends on size and with or w/o reservoir, brand of coils, etc.
FOX, Swayaway and Radflo are going to be less $$ than the King's.
But for a remote reservoir, 2" body, 12"/14" FOX or Radflo with dual rate hardware and coils is right at about $500 a corner, $550 is with zero rate tenders.
i've heard of roadracer i think? they're red and have the roadrunner emblem on them...not sure of price, but they might not get mentioned
RaceRunner? Has a dinosaur looking dealio on them? They are made by Swayaway.