Silver isn’t my first choice but Amazon has the Rotring 600 0.7mm silver for $18.29 right now.

https://www.amazon.com/rOtring-1904444-Mechanical-Pencil-Silver/dp/B00AZX1P9C/ref=asc_df_B00AZX1P9C/?tag=hyprod-20&linkCode=df0&hvadid=167123392997&hvpos=&hvnetw=g&hvrand=12752414864421160894&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9028731&hvtargid=pla-362712258887&psc=1

I prefer the feel and look of the 0.7mm more than 0.5 or smaller. I recommend just googling rotring 600 and click the shopping tab once in a while. I’ve gotten a black and blue for $18-19 and I’ve seen the silver and red versions pop up pretty frequently at the same price.