P&D Enterprises is a site sponsor and they carry Leupold. These are the prices listed on their optics page. $700.00 price difference based on whether you want the locking adjustment turrets or not and main tube size.
Mark 4 6.5-20x50mm (34mm) ER/T M5 Locking Adj. Matte Front Focal H-58 $3,712.00
Mark 4 6.5-20x50mm (30mm) ER/T M5 Matte Front Focal H-58 $3,044.00
Mark 4 8.5-25x50mm (30mm) ER/T M5 Matte Front Focal H-58 $3,296.00