If you cant find eclipse glasses, you could buy some welding googles or a welding helmet for less than 20 bucks.
How to make sure they work :
You can't see anything while your staring through them unless you stare at something super bright, if you can still see through in normal lighting they won't work and you have probability of eye damage if you use the non pitch black ones.
You can find them at general hardware stores or you can go to walmart and you can be sure to find them at Home Depot or Lowes.
