>>1886686> commuting E-bikes under $1000If you want anything worth using your certainty in the realm of DIY. It’s totally possible to build something reasonably solid out of used and junk parts on that sort of budget but requires tools and skills not everyone has. Sub-$1000 turnkey products will likely be totally unaffordable in the long term. It’s the BSO problem: there’s only so low the quality can practically go.
>foldingYet another level of complexity. The hinges and tiny wheels make everything harder to build and design with acceptable ride quality. The common wisdom is only get a folder if you know you really need one, and if you do buy quality.
You seem to be setting yourself up for a fall, stay safe.