No they don't replace balls...lol. I just get them at prices that are lower than ball replacement.... so no ball replacement here...at least not today. lol
Dang, you can get a +$100 tip for under $20? I said this in another post and I'm starting to feel like a troll "I ain't from Missouri but..." that's a heck of deal!
Haha, well not for $20 just north of that @ 29 for 3mm SN. But don't get me wrong Qmark makes a good product and not trying to put them down by any means.
At some of the smaller places I worked in the past we were able to offer up to 40% off Renishaw brand Styli being a rep for them so you should be able to get decent deals if you find the right supplier.