@leezmaze - the rhodium plated plugs are the most "affordable" I could find on eBay
I actually prefer the Sonarquest or Vanguard silver plated copper because silver plated copper has the best conductivity rating
Pure copper (not plated) have a tendency to oxidize - whereas the silver sulfide on the silver plated plugs can easily be cleaned. Having said that I am yet to clean the Sonarquest plugs I have after 3-4 years of use.
Vanguard silver plated copper are a little more affordable, but are not as well made, but I still have a set of them that are 3-4 years old and have yet to see signs of tarnish as well.
The Sonaquest IEC connectors are better because they clamp like a vice
I listed that plug because you were looking for a $10-30 power cable, so I posted the more affordable plugs. I have used plugs like these also, but they are not as good as Vanguard or Sonarquest.
There is not a lot to choose between Gold plated or Rhodium plated copper from a performance perspective - they simply do not perform as well as Silver plated copper.
Beware - some silver plated or rhodium plated plugs are brass under that plating, they pale in comparison to the silver plated copper .
In the end it all comes down to what you are prepared to spend - just giving you some options :-)
I use Sonarquest on all my power cables these days
Hope that helps - Steve