cheap stuff

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I bought 100 meters of hemp cord for $4, I used it to make a suspended cabinet, with stretched cord, and it makes me wonder what else I could buy which is ridiculously cheap, compared to its utility.

For example, microcontrollers and lasers are ridiculously cheap for what they can do, as are many electronic parts.

I think there should be a list of stuff which is ridiculously cheap and which inventions can be made from.

For example, hydrogen and oxygen are ridiculously cheap, because you electrolyse from water, and they have great utility to make balloons or water breather (you can also make caustic soda/chlorine from salt water electrolysis). The non-cheap equivalent would be to use a 12V motor with battery to lift your stuff, when just hydrogen would do.

What is the most inexpensive rocket fuel? I have to send bacteria and human bitches DNA out of the fucking solar system before we all die and it explodes. Coal is another thing which is quite cheap for its power. It has 24 MJ/kg while alkaline batteries have 0.5, and lithium-ion from 1 to 2 MJ/kg. Another cheap thing is mylar fabric, in survival blankets, which are cheap mirrors when stretched.

In another category, it's slightly immoral but with a wire saw you can go cut down some trees for material, and it costs less than $2. I'd love to know what is the cheapest structural component for rigid constructions under no-to-light stress. I'm considering melting soil or rocks into bricks, with a lot of amperes. I think that'd be the cheapest, but it's slightly dangerous, and immoral, and annoying. I admit that along the same idea, I considered going around at night to take the metal bars from hidden and visibly useless fences. Call the cops, I'm a psychopath on the dole, banned, and behind 7 proxies.

Anyway y'all will have nothing to say, as every time I post something, people have nothing to say, and it's annoying. I'm leaving. Also, there may be potential in tensegrity structures stuff. Goodbye