Buy welding googles like these: ($5.29) https://www.harborfreight.com/2-piece-welding-goggles-set-35...
And combine that with a real pressed CD. NOT a recordable CD!! It must be a real, aluminum colored, CD! (And one without a label.)
I did this to look at the transit of venus over the sun a while back. Worked fine, but my viewing time was limited.
However I must add that they advise against doing this, not because it's inherently unsafe, but because if you mess up (for example the CD has a scratch) you can hurt yourself, so......
If you use #14 or even #13, there's no need to stack them with anything. They are sufficiently dark on their own. #14 are even ISO 12312-2 compliant for the purpose of eclipse viewing.
Here's the best information on related topics:
> One of the most widely available filters for safe solar viewing is a number 14 welder's glass, available through welding supply outlets.
https://eclipse.gsfc.nasa.gov/SEhelp/safety.html
While there's probably also huge demand for welding goggles right now, a majority of people shopping for eclipse viewing gear might not know that (some) welding eyewear would be safe for eclipse viewing. (It would be a good idea to ask an expert before using arbitrary welding gear to view the sun, in case different kinds of welding goggles block different parts of the spectrum to different extents.)