This forum actively discourages transactions of new or used instruments, except the Dealers section allows posting of availability (but not pricing). So you might not get the responses you were expecting.
That said, I would encourage you to check out Reverb, Vintage Rocker and The Gear Page, as toothace mentioned - they are the main re-sell sites I check out.
Also, troll the Guitar Center used website, select "PRS" as brand in the guitars section, maybe narrow down by price (CEs go for somewhere just below $1000 to above $1500, so pick your pain threshold as you see fit) and then scroll through looking for the guitar you want - the search function does not do well looking for "CE" or "CE22" or "CE24" or "CE 24" etc.
there are a few CE24s there right now...