I was able to find some generic smartphone screen protectors at Ross. I haven't actually put it on my iD L yet (cause I'm lazy lol) but I've used them before, and you need to very carefully cut it to fit the size of your Tama's screen. Make sure you DON'T get the hard screen protectors, get the soft filmy ones. The hard ones will not stick to your screen well and dirt will collect under them, as I've learned from experience.
If you're worried about cutting the screen protector (especially if you have trouble cutting things in a straight line) ask someone else to cut it for you. My mom was able to cut my old screen protectors much better than I could have, though those screen protectors were the hard ones and I ended up throwing them away.
I recommend scissors or, if you've got a very, very skilled parent/guardian/friend/relative, they can use a blade and ruler to cut the screen protector in a well-measured, straight line (That's what my mom did.).