An interesting development: the Zeiss C Biogon T* 4,5/21 ZM ($1,201) and Distagon T* 4/18 ZM ($1,428) lenses for Leica M mount are both currently listed as discontinued on Zeiss website (see this and this page):
Zeiss is currently offering up to $250 rebates on selected Zeiss ZM lenses (B&H, Adorama and PopFlash are eligible for those rebates, Amazon is not):
This offer is valid till December 31st. The mail-in form can be downloaded here.
