How big of a spacer are you looking for?
I have used various brands of wheel spacers and have found that optionselect http://www.ebay.com/itm/HUBCENTRIC-W...item230ec3e9bc
has a good quality spacer. The studs and nuts are as good as the more expensive brands. The spacer nuts are actually harder than some of the "mainstream" brands, as I found out the hard way.
I used them in the past and will use them in the future if I need spacers.