RATCHET & CLANK-HOW DO YOU GET THE E ...

Hey everyone, i really really REALLY need help, because i need the electroshock boots, but my problem is that i've completed the game once, and now im in challenge mode, i didnt know that you get the boots in the medical outpost omega when i was in normal mode, so now thatim in challenge mode, the prize for vertigo is 8500bolts or something around that, and i dont want to start a new game, so can anybody help me please?.......