That's a very good price for that version of Robby, as they're now becoming very collectibe--if you both collect and build kits (as I do). Retail was around $17-18.00 as I recall. There should be some helpful hints posted on this site somewhere on various methods of safely stripping "chrome" from plastic. Over the years, FSM has mentioned products that will do the job.
BYW, I built the regular Polar Lights Robby--but with some modifications and additons to "improve" it. I used the Jimmy Flintstone Productions resin Altara figure and lower half legs kits (legs apart stance) to replicate the Forbidden Planet movie poster. (Available from CultTVMan.com) Unlike the poster, I matched Robby's original color to video-captured images from the MGM DVD. I airbrushed SnJ Spray Metal Silver darkened with black and a touch of blue (as seen in some scenes in the print) to replicate Robby's original medium gunmetal color. I also scratchbuilt a few new head pieces that weren't quite accurate in the kit. I topped it off with a resin nameplate (also avilable from CultTVMan.com) painted to match the film's title logo. Over all, a fun build for this longtime Forbidden Planet fan and collector.
--Ken