Seeking advice on purchasing a vintage Hermes “So Kelly”

Hi beautiful Hermes lovers! I am a huge Hermes enthusiast myself. I am more of a casual girly and I lean towards styles like the Jypsiere, Kelly Ado and the Herbag which I use fairly often. I recently become OBSESSED with the So Kelly style. I’ve been looking tirelessly around the web for one in a neutral tone (Noir, Raisin, Bleu De Prusse, Craie) preferably in a size 22. Unfortunately, it seems like I’m in too good of a company since I can’t move fast enough to ever “snag” one of these online! I would really appreciate your tips and tricks in getting your hands on a great preloved bag like this from a reputable reseller located in Japan/US. Thank you!!!