Most welding helmets have adjustable shades/darkness from #9 to #13. It would be a little silly to go buy a $45 welding from Harbor Freight just to view the eclipse, but you can buy the glass at most hardware stores for around $10 (usually come in a 5"x5" sheet)|

Edit: for everyone looking you can buy these sheets of lens https://www.amazon.com/US-Forge-00097-Shaded-Welding/dp/B00164VP26

You can try a harbor freight / hardware store for welding goggles. From a quick Google search you need a shade 12 or higher I believe.

Or hold this up to your face? https://www.amazon.com/US-Forge-00097-Shaded-Welding/dp/B00164VP26

Good luck, kind of crazy and probably a shame for a lot of people that glasses are sold out