sandy, is the debt really yours? If it is, then the next step is to determine who you should negotiate with....the OC or the CA.
It sounds like the OC still owns the account. If that's the case, I'd bypass the CA completely and negotiate only with the OC. Instruct them that for such a small balance, you'd be willing to pay in full with a cashier's check immediately, IF and ONLY if, they in turn will instruct the CA to delete all derogatory information about the account from your credit file/files.
If they agree, also stipulate that you will exchange that cashier's check for a duplicate original of the letter, from the OC instructing the CA to delete the derrog from your account.
But that's just what I've done in the past and was successful in having 3 collections removed, using this tactic.
I'm sure others will chime in shortly offering their opinion as to best course of action.
Good luck to you.