There's a local building materials recycling joint that has about 20 of the old soda-water bottles you turn over to charge, varying in condition from $20 to $60.
Most of em look to be in usable condidtion & have inspection tags dated from 1976. there's a couple presurized types as well, I didn't get a good look at those tho.

If anyone would like a set of these for your lil red wagon let me know and I can go see what they have, how much, and get some photos.

1956 GMC 370 dump " 'Tater "
1970 VW Volksrod "the Black Bomber"
2007 Chevy Avalanche
2020 Jeep Cherokee Trailhawk,
2005 Harley Davidson FLHTCUI

I dig all cars, old and new, whether they were hammered out of American iron, German steel, or Japanese tin cans. Being unable to appreciate them all is missing out on a world of great things.
But thats just MY opinion! :P