I like to buy Griswold skillets off eBay, clean them up and give them as gifts to my friends. I only buy the #9 skillets, as they are reasonably priced and big enough to be practical. They are about 11 inches in diameter; Griswold must have sold a bunch of them because there are a lot on eBay. It's been awhile since I bought one, but they usually go for around 30-40 bucks plus shipping.
My first skillet was purchased by my mom back in the fifties. She couldn't figure out how to season it and never used it much. I took it with me to college and I've had it ever since.
Do some research on Griswold before you buy. The company went out of business in '57, but there are newer skillets with the Griswold brand. You'll be able to identify them using information on the web; they're OK pans but not as good as the older stuff. Post '57 skillets will not be marked with "Erie" (PA), home of the Griswold plant. My preference is the skillets made in the twenties and thirties with "large", "slant" or "medium" logos. Newer skillets with the "small" logo are cheaper but heavier and not quite so nice; they're still very good pans. The older skillets with heat rings aren't real practical for modern stove tops.
Look carefully at the pictures when buying, you don't want a severely pitted skillet. Usually sellers will disclose if the skillet is warped, but don't bet on it.
Now you could just buy a new Lodge skillet. The problem with them is they don't have a polished cooking surface like the Griswolds. Good luck.