I mostly use a food-grade plastic fermentation bucket. Easier to carry, no worry about dropping a fully loaded glass carboy. Also easier to get the wort into the bucket than a carboy.
But, I also have a couple glass carboys(6.5 gallon) I picked up off Amazon for $30 each (shipped). I've used these, and they have the advantage of being able to watch all the awesome yeast action.
Last n brews: (P=Primary) (K=Keg) (B=Keg->Bottle)
7/26: Flower Power(P) 6/13: Rolling Rock (K), 6/09: Yooper's Pale Ale (K), 5/27: Columbus IPA (K), 5/17: Victory Hop Devil (K), 5/15: Summit MO SMASH (K), 5/12: Sierra Nevada Celebration (K), 5/03: Schwartzbeir (B) 4/10: Birch Beer (Soda) (K), 3/31: Sierra Nevada Pale Ale (B), 3/25: Belgian Ale (SWMBO slayer) (B), 3/21: mrbowenz English IPA (B), 3/17: Mirror Pond Ale (K), 3/17: Blue Moon's "Old Country Cousin" (B), 3/15: Sculpin IPA (B),