I just got this one that's both a distributor and tamper and is 58.5. You'll spend $20 more than your target but it's so worth it. (Originally I had bought a nice sturdy tamper to replace the plastic one that came with my GCP, then I decided to try the same brand but calibrated, and then I saw this one mentioned in either this group or r/espresso. Anyway it came on Friday and we LOVE it. Thank heavens for Amazon free returns for the others :)

https://www.amazon.com/gp/product/B081X9N9Z3/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

Try amazon smile to donate to a charity of your choice automatically at no cost to you!
https://smile.amazon.com/gp/product/B081X9N9Z3/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
^{I'm a bot and this action was performed automatically.}