To anyone with a ripped screen lid:
I haven't been able to find any replacement slide-in screen lids (stores, internet, or otherwise), but I have found out that if you have the type of lid that has a rubber seal around the inside of the underside of the lid, those can be taken out and the screen fully replaced just as you would replace the screen in a window or door. You simply remove the rubber seal (all in one piece preferably) using a special screening tool, lay the new material over the frame, cram the rubber seal back into place to hold the screen in, and then cut off the excess. If all that sounds too complicated, just find someone who has replaced the screen in a door or window...it's the same process, and takes about 5 minutes. I now have a lid that looks brand new again!
