Just to clarify, are you asking about ingredient kits or about equipment kits? I think what Mike said is definitely true for ingredients - you get what you pay for. As for equipment, the basic kit is essentially a couple of food-grade buckets, maybe a carboy, and a whole bunch of small stuff - hydrometer, capper, etc. I found a great deal on craigslist for my equipment: $125 for 3 glass carboys, a ton of bottles, a bench capper, wine corker, 8 extract cans (long expired - my first brew with these was pretty awful), hydrometer, bottles brush and various other things. I suggest trying to find used equipment. However, be careful about used plastic for fermentors (buckets, better bottles). The tiniest scratch can harbor infection.