Can anyone reccomend a good no pull type harness for a Mastiff (formerly known as English Mastiff)?

Our boy Duke has a tendency to pull (sometimes) on the leash & yes yes I know I have heard it all before about how I have to "be like a tree" & stand firm & all the rest of it. Haha I am 5-2, & 130 pounds and Duke is 13 months and nearing 200 pounds. As soon as we get him fixed he is going to obedience cles so this doesn't become a nasty habit but for now does anyone know of a harness that will help eliminate the pulling? I know most harness do the opposite & most encourage pulling but there has to be SOMETHING out there that will fit him & work better than just his Mastiff collar we just bought him which costs us $90 bucks haha Thank You! :)