I got these from Fisher Scientific. They are thick and food grade. And they have an extended wrist because the bees like to sting just above the top of the glove. :) They do make your hands sweat though.
Best* CleaN-DEX* Ultimate 100% Nitrile Gloves, Exceptional puncture and chemical resistance, Manufacturer-suggested ISO Class 6 (Class 1000). Ideal for hand protection in critical environments., C9905PFSW, C9905PFMW, C9905PFLW, C9905PFXLW