Cut bottles are nothing new, I have seen a slew of them for sale from various shops over the years. What is unique about these particular ones is that I actually know the person who made them. My friend Tyler of Plastolux fame picked up bottle cutting kit and ended up with some amazing looking cups.
Being the good guy that he is, he shares all the tips he learned in case you want to do it yourself. If you are not up to the challenge, no problem, he is selling them for cheap on his Etsy shop. Don't see the one you want for sale? I have a feeling that if you beg, cry and plead he would make a new one just for you.