Another popular kit is: http://www.emdmillipore.com/food-analytics/rapid-arsenic-tests/c_Hzib.s1OprIAAAEbFfcXP9oy

Quick Tip: When ordering a kit always check if you're getting the acid and zinc. The acid will have to be a solid, as it is illegal to transport liquid acid and zinc in the same container. The new MQuant kit above does have both. It looks like the Grainger ones do too. The older kits didn't so you'd have to order the acids separately. Always worth checking, especially if you're in a hurry!