They make little 3in peat pots. Not reusable but they’re not plastic and and about the same size as a solo cup.
Picked ours up at Walmart in az
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I’m a east coast guy. They sell them at stores. Haven’t drank in 10yeara so couldn’t tell ya if the bars have them.
But they could be ordered through Amazon or Walmart. I thought they were a pretty badass design when I first saw them.
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Not really adding anything new but my opinion is, stay away from that aluminum stuff. Use the mentioned terracotta or peat pots or make small paper starter pots yourself like I’ve seen on here somewhere (may have been in one of @ReikoX’s threads).
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It wasn’t so much about what to start with. I have used a variety of things. It was more about diversification of the current set up. Terra Cotta is a viable option. I however can’t use them, along with soil weight. And have the trays hold up or even be liftable without breaking. The aluminum was a thought due to strength to weight ratio.
I am thinking that over long term. Aluminum is not a good long term solution, but the weight to strength is a big thing for me.
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I think I misunderstood the “30 days” from your earlier post then. I thought it’s about starting them, now I see it’s about keeping bonsais long term. Nevermind. 
(I would avoid the aluminum even more then :P)
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Ive been looking to see about aluminum degradation chart. To see just how long it takes to actually start to decompose when interacting with any chemical. Most degradation starts at a high temperature, and really doesn’t seem to have a large effect from other stressors. Long term, their is a high probability that something will interact with the aluminum, but more so it seems the same probability of something decomposing the #6 plastics. Especially growing organically. Which I guess using solo cups isn’t 100% organic anyways.
But from long term exposure to them. I have just finished flowering two plants which stayed in them for over 6 months. I once it’s dry. Will send it out to MCR labs for a heavy metal test, and see if the 6 months in LOS or in the Coco after have made a huge difference in finished quality.
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Temporary respite per op.