I'm using Nutri-Lock bags, $20 for (2) 50 foot rolls, 11" wide, they are BPA-free:
https://www.amazon.com/Nutri-Lock-Vacuum-Sealer-Commercial-FoodSaver/dp/B01CDY8SOK/ref=sr_1_1?ie=UTF8&qid=1484272223&sr=8-1
They're working well for me so far. They are sold on eBay too.