Assuming you mean referee jerseys, not many. You can sometimes find European websites that have them but specific sizes and colors can be hard to find.
If it's the 2010's you're looking for: http://www.heyref.ca/store/cart2/adidas-world-cup-2010/ They have much better size/colour selection than ProReferee. (Also has Euro, CL, etc.) Not sure what shipping to the States would be though.
Question - does anyone know how these fit? I assume they fit similar to an MLS Formotion jersey, but not sure.
The official retail price in Canada was 80 short, 90 long. (And isn't 50 about the same as the OSI..?
Well, "no opportunites" in "competitive, affiliated" matches is a bit too strong. I do a couple of tournaments that are sponsored by Adidas. We are encouraged to wear Adidas kits if the crew has a set, and the color makes sense. I am also aware of an affiliated league where the competition authority allows the refs to wear Adidas kits, again if the entire crew has it and if the color makes sense. That said, I mostly wear my Adidas stuff on unaffiliated, solo, indoor matches.
http://www.soccersavings.com/customer/category/product.jsp?SUBCATEGORY_ID=40553 They don't have the red or green but I'd keep an eye on it. You never know if it might pop up.
Referee World in Germany has four of the six colors. Shipping sucks though ($35-40 USD). I ordered a set of b+d flags from there earlier this week. Will let you know how long it takes to arrive. http://www.refereeworld.com/catalog...79990&osCsid=97550384d462c698272a924aa1d5da0d
Here's a black one for $50: http://www.soccersupplies.com/prod/refereegearapparel/refereeuniformsshortssocks/RU-A001
I got the black just now from SoccerPro. I plan on wearing it for high school matches in our area which still allow black to be worn.