McCarr Master has chrome plated acorn nuts for $1.88
Part Number: 91982A250
http://www.mcmaster.com/param/asp/PSearch2.asp?reqTyp=parametric&act=psearch&FAM=nuts&FT_153=61048&FT_1451=61050&FT_255=22661&FT_201=62172&FT_241=63223&FT_147=60655&FT_137=55128&FT_1464=60785&FT_2234=111696&ppe=4&session=nuts,153=61048,201=62172,241=63223;1451=61 050;255=22661;M;I&sesnextrep=601464651433943&ScreenWidth=1024&McMMainWidth=816

And Stainless Steel. A pack of 20 for 6 bucks which I believe could be polished.
http://www.mcmaster.com/param/asp/PSearch2.asp?reqTyp=parametric&act=psearch&FAM=nuts&FT_153=61048&FT_1451=61050&FT_137=60708&FT_255=22661&FT_201=62172&FT_241=63223&FT_147=60652&FT_2234=99146&ppe=2&session=nuts,153=61048,201=62172,241=63223;1451=61 050;137=60708;255=22661;M;I&sesnextrep=601464651433943&ScreenWidth=1024&McMMainWidth=816

I found a pack of 50 stainless ones on ebay for around $5, but they're in the UK...I bought them anyway and got a bunch of other stainless hardware from them too.