One handed offers from Amazon.com

Set of 2 Olle grinders, 1 for pepper and 1 for salt. Sophisticated styling with 1-handed grinding operation. New carbon-steel rasp for pepper grinding; non-corroding ceramic for salt. GrindTune mechanism adjusts the output from coarse to fine.
Price: $39.95 [Notify me when price goes down.]

Batter bowls are so handy for mixing, pouring, and storing. Batter for cakes, pancakes, crepes, waffles and more. Stain resistant. Rubber ring on base.
Price: $15.99 [Notify me when price goes down.]

Sturdy enough to hold up to 750 lbs. per pair!. Adjustable to four positions: 90, 80, 70 and 0 (closed).. Spring-loaded, one-handed release lever keeps hands and fingers from getting pinched.. Zinc-coated steel construction .
Price: $29.99 [Notify me when price goes down.]

Comfortable 4.5-inch micro bar clamp that helps deliver a true one-handed operation experience. Ergonomic handle design, with bar extending away from work piece. Compact design adds greater versatility for hobby and other craft projects. Can be converted to a spreader with 4-to-8-inch spreading capacity.
Price: $9.99 [Notify me when price goes down.]

Finally, a rocker knife worthy of great chefs! Ulu knives have a unique design which increases dexterity and leverage, making fine cuts simple and chopping easier.. The blade is made of stainless steel and has a large, easy to grip wooden handle. This is an excellent tool for single-handed people or people with weak hands.. The Ulu rocker knife performs most culinary chores with ease and efficiency - from chopping nuts to slicing cheese and meats. One aspect of this knife that sets it apart from other rocker knives is that it can easily be sharpened, giving it much longer usability.. The blade on the Ulu Knife measures 6". Walnut knife stand and instruction book included..
Price: $18.00 [Notify me when price goes down.]

PerfectTear Paper Towel Holder lets you tear off one towel at a time with only one hand!. Have you ever had to struggle with one hand to get paper towels off a roll? You end up with more sheets than you needed, or worse yet, the whole roll may end up on the floor in the very spill you were trying to clean up.. Designed for single handed use, the PerfectTear Paper Towel Holder actually grips the cardboard tube inside the roll. The roll is held in place so you can tear off sheets one at a time, yet it still turns easily when you need more than one sheet for bigger spills.. The base of the Paper Towel Holder is weighted and has non-skid rubber feet so it won't slide across your countertop as you pull. A rod on the side keeps the loose end sheet in place between uses..
Price: $22.00 [Notify me when price goes down.]

USB plug-and-play keyboard. Optimized for right-handed use. PC and Mac compatible. Ergonomic design.
Price: $139.99 [Notify me when price goes down.]

USB plug-and-play keyboard. Optimized for left-handed use. PC and Mac compatible. Ergonomic design.
Price: $139.99 [Notify me when price goes down.]

One Handed Spinner Jump Rope. Jump rope activity where the twirler and 1,2 or more people can jump in. Slight circular motion on the baton gets the rope and ball going around in circles on the ground. Each set includes blue, green, orange, purple, red and yellow.
Price: $30.00 [Notify me when price goes down.]

Razor Sharp 440 Stainless blade. Lockback folding knife. 4.5"closed mirror polished blade. Pakkawood Handle.
Price: $7.99 [Notify me when price goes down.]