I have one of these spin towels. It comes with one that covers the handlebar and one regular towel. The only thing I don't like about it is that I point a giant fan up at myself while I ride and it blocks the wind a bit For the monitor, are you thinking about a cover for when you're not using the bike or a screen protector?
The Drip Accessory Connected Fitness Screen Cover gives your connected fitness screen the protection it needs when it's not in use. Made from a soft and stretchy poly blend scuba material, it’s like a little hug for your fitness screen! Check out this must have screen cover here.