Microsoft have a lot of decent ergo keyboard offerings. A friend with wrecked wrists swears by his Sculpt Ergonomic (within your budget and stocked by many phys

Microsoft have a lot of decent ergo keyboard offerings. A friend with wrecked wrists swears by his Sculpt Ergonomic (within your budget and stocked by many physical stores so you can try it in person), although it acts funny under Linux. I have a Comfort Curve 3000 which is under $20. It's the only curved keyboard in this price range I know of.