You might want to have a browse of !ergomechkeyboards@lemmy.world as well as the subreddit. Within that budget the best bet is likely something DIY. Though there is a middle ground with vendors offering build services and kits that are hot-swappable, turning "building" into "assembling".
Have a look at some popular choices and lists likes in the EMK wiki that I put together.
I have not used one but am certainly interested in Perixx ergo keyboards. They have TKL and 100% sizes and wired and wireless versions. Reasonable pricing as well.
For a bit higher build quality with a price to match there's Keychron Q10 , there is a slightly cheaper version that is wired as well.
I have come from the ergo side as I have had pretty bad RSI in the past. I have a Perixx PERIBOARD which I got to replace an MS ergo keyboard after I dumped coffee over it and needed a new keyboard the same day.
It's pretty good, quality is good, the wrist rest is hard plastic and feels it but it's not bad. I spend all day, every day typing and it's held up pretty well. Haven't had any issues with connections, wireless works fine. It's robust, keys feel OK. It's not a $300 keyboard but honestly feels better than the $60 it costs. If you're starting out on the ergo trail, I recommend considering them at least.
Thank you for the review! I've been eyeing Perixx because it so closely resembles the MS Ergo keyboard I love.
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