B&H Photo-Video offers the X-Rite ColorChecker Passport for Windows or Mac for $99 before in-cart discount, $69 after. This $10 mail-in rebate cuts it to $59. with free shipping, that's tied with our June mention (which lacked a rebate) and the lowest total price we could find by $40. It functions as a white balance target, creative enhancement target, and color control target for post-processing consistency; the balance card enables reflected-light meter calibration. Deal ends December 31.