Tri Bars for Aeroad (standard bars)

Hi. I'm doing a Ironman triathlon in September and im looking for some tri bars. I'd like then to be slightly raised up. I'd like something similar to the following, but not $600! I have the early version bars, so circular in shape, so standard clip on bars should work fine.

https://www.santafixie.co.uk/deda-elementi-jet-one-clip-on-340mm-full-game-handlebar-extension-black.html