30*F doesn't really count as cold for me, I generally just wear mechanic's gloves bought at Harbor Freight, they're fairly lightweight so if you think 30*F is cold, they probably won't be enough for you.

I wear blaze orange hunting gloves from about 15*F down to -20*F. They're basically just thinsulate lined ski gloves. I can pick them up for $10 in the after season sale in the hunting section of the stores. I bought hunting boots there for $35 too, nice high top, waterproof nylon, thinsulate lined boots, they work great down to -20.