Which JF "free with purchase" coupon motivates you the most? For me, it's the multi-meter. I probably have four or five of them. I did manage to kill one, hence the spares. Honorable mention to the 9 LED flashlight. Love having those stashed around the house, tool boxes, and in the vehicles, even if they're redundant with higher quality flashlights.
HF has lately been sending coupons for the multi-screwdriver (reversible shaft and bits). Haven't tried it yet. May do that one next.