cheaper alternative to iPencil

I am learning to improve my drawing skills with this new stylus. I wanted to get a stylus for a while after seeing Apple show of the pencil for iPad and this one is just what I was looking for. Right out of the box it was a very easy-to-use piece of technology with me only having to double-tap to turn it on and off. It also feels great in my hand when I'm using it even for extended periods of time. It has groves on it similar to a pencil and it is also the size of a new pencil. The stylus also came with an extra tip so if I drop or damage it, I have a replacement. The tips are smooth so I don't have to worry about it potentially scratching up my ipad's screen and the tips also are very easy to change out. I just screw a tip on till hand tight and untighten to replace them. Charging the stylus also could not be easier because there is a little silicone dust cover I pop in and out at the top of the stylus then I just plug in the USB cable it came with but I have only had to do that a few time because the battery life is insanely long.