Don't get a hybrid bike, if you really want a type of hybrid bike get a cycle-cross bike, which is a road bike with mountain bike tires and brakes.
I use to have the typical hybrid, Mountain bike frame and road bike tires, it was the "safe" bike to get bake into cycling, but it was a boring bike and I regretted my purchase.
If you are young get a steel road bike, much more fun and comfortable, as the drop bars give you many positions.
The cheapest source you will find for bikes is
http://bikesdirect.com/ but then keep in mind you are forfeiting any value adders your local bike shop may have like free adjustments and repairs.