Where can i get one in advance of January - starting new year with SJO-BOG-GRU-GIG-GRU-YYZ-YVR, then, YVR-YYZ-GIG-GRU-IST-MAD-FCO-IST-YUL-YYZ (and possibly squeeze YVR-LHR in but not sure spouse will tolerate being away entire month, and home just enough time to swap clothes - and no jibes please she might prefer this)

Fortunately flights mostly in biz, but will still need brace to get up from lie-flats