I've found options that don't require electricity and are easy to connect (no plumbing experience required) albeit with fewer features than a Toto. https://www.tushy.me/ is an affordable one like this

Just when I'm reading about that product, a pop-up appears, "Enter your email for free shipping (and "news" that won't clog your inbox"). There's no way to dismiss the pop-up. I was considering buying the product before that happened. It's such a strong signal that the site operator is a scumbag that I won't deal with them. It means the site is about collecting e-mail addresses, not selling and servicing products.

The popup is coming from "justuno.com". They're in San Francisco. They have a CEO with a beard, as if they were cool.

Add to block list.

I got mine as part of a broader bathroom renovation but the plumbing by itself is pretty straightforward. That said, you do need an appropriate electrical outlet near the toilet and, based on earlier research, smaller (round) toilet bowls are not ideal for being retrofitted.

in japan its not super cheap either unless its already installed.

Ours was around ¥13,000 / US$115 when the landlord replaced it last year