One of the better arm warmers I've used comes from Ibex. Craft, Pearl Izumi,Descente, Sugoi, Giordana, Sock Guy,Castelli,Garneau,DeFeet,Canari,Terry and tons of others make quality arm warmers. Primal Wear makes them in Camo and Tatoo pattern, you can get them with state flags on them but my favorite is from SheBeast called Pink Highball
I also like their Orange Hibiscus Bolero but even with sausage casing lycra I can't quite get a comfortable fit, you could be the first out on the trail with them if you don't have Terminator arms.
One of the better ways to find cycling items is to go to www.qbike.com, it gave me 656 hits for various retail and ebay listings.