이베이를 사용 안해봐서 모르겠지만 현재로서는 몇개 가격이 무지 낮게 책정된 듯 하네요.
http://www.ebay.com/itm/2x-Custom-R4-Punisher-Metal-Cherry-MX-Key-Caps-Made-from-Zinc-/330712313304?pt=PCA_Mice_Trackballs&hash=item4cfffd6dd8
http://www.ebay.com/itm/Custom-R4-Jobs-Apple-Metal-Cherry-MX-Key-Caps-Made-from-Zinc-/330712312538?pt=PCA_Mice_Trackballs&hash=item4cfffd6ada
http://www.ebay.com/itm/Customized-Cherry-MX-Key-Cap-/330704079850?pt=PCA_Mice_Trackballs&hash=item4cff7fcbea
http://www.ebay.com/itm/Jobs-Apple-Customized-Cherry-MX-Key-Cap-/330703086307?pt=PCA_Mice_Trackballs&hash=item4cff70a2e3