I just got one of the cheap ones from eBay a few days ago. There are a ton of sellers with the same thing varying from ~$2 up. I paid a little more to get one shipped from the US.
I was underwhelmed when I opened it up as it was really thin and didn't fit very snugly on the remote. I haven't used it much yet to get a full opinion of it. We have a 2 year old, so I also wanted some protection. Although we have laminate floors, which will probably be a lot more forgiving to glass than tile. I figured a few bucks will be worth it if it saves that remote in a fall.