Most of the good ergonomic keyboards are around the same price. Look at this one which it is good, but I personally didn't like: https://kinesis-ergo.com/shop/advantage2/
Basically what put me off was the way the keys are arranged in a semi circle. It was uncomfortable to code. I am not sure if it is because I have big hands or just the design didn't work for me.
You could try Microsoft's ergonomic keyboards, they are cheaper, but I personally didn't like them either: https://www.microsoft.com/accessories/en-us/products/keyboar...