Many people are making time to see the eclipse Monday, Aug. 21. However, eclipse glasses are necessary to even look at the eclipse, at the risk of damaging your eyesight.

The average person has a lot more to think about than picking up a pair of eclipse glasses, which has left them searching for some now. Sadly, a lot of stores are completely out of stock. It’s partly because of high demand to view the eclipse, since it will reach close to totality across the entire United States.

But there are more nefarious reasons for this shortage.

Some wise guys know it’s easy to profit off eclipse glasses. Although they provide a great deal of protection, they’re cheaply made and would sell for $10 at a gas station.

People started to buy eclipse glasses in bulk. Then, they used a website like Facebook or Craigslist to sell them for a marked-up price.

There are some eclipse glasses for sale at double the price, but some even reach up to $100.

It seems unfair, but there’s not much to do about it. This happens all the time with concert tickets or other popular events. There are some preventative measures that may have worked, however.

Stores could have set a limit for the number of eclipse glasses a customer could buy, or maybe a way to reserve a pair.

Here’s a last-minute solution if you don’t have your eclipse glasses, courtesy of Kellog’s:

Supplies needed:

– An empty cereal box

– A piece of aluminum foil

– A small nail/pushpin

– Tape

– Scissors

Steps:

1. On a piece of paper or cardboard, trace the bottom of the box, then cut out the rectangle on the paper with scissors and tape it to the bottom of the opened cereal box. That will be used as the screen of the personal theater.

2. Next, simply cut out two squares on the top/lid of the box that measure about 1.5 inches and tape the lid securely back together.

3. On one of the squares you just cut out, cover the hole in aluminum foil and tape it down. Next, poke the small nail/pushpin through it once. This will be your lens and hole that the eclipse will project through.

4. When using your new box theater, you will have to turn directly away from the sun and allow the rays to shine through the small hole made with the nail/pin. To see the eclipse as it happens, look through the other hole in the lid — the one without the foil — and you should be able to see a projection of the eclipse safely.