All the usual suspects (AIM, Classic Arms, SOG, Century, Samco, RGuns, J&G Sales, I.O.) seem to be bone-dry of M44's/M38's. Unless somebody else knows of any other volume sellers, I would guess that your best bet would be an individual or auction sites such as the one you mentioned. How long ago did you see M44's advertised for $99? I struggle to find any below $150.