bow hunting online stores

so im looking for a crossbow to hunt with. I am looking for something that will be strong enough to take down a buck during season. I really dont know anything about them except that i would rather have a crossbow then a regular bow. I have been looking online and in stores and i have seen some brands such as Barnett and Horton also Ten Point. I not looking to spend 1000 dollars or anything something about half that or less. I really dont know what to look for in a crossbow honestly, I NEED SOMETHING THAT IS GONNA TAKE DOWN A DEER DURING SEASON. So, whats a good draw weight, feet per second and really anything else that is gonna help me out i would really appreciate.
Thanks to all.
Look at the Barnett line up of crossbows. They make a good product at reasonable prices. I would get the package deal so some money can be saved. I would not get a draw weigh less then 150 lbs.The Barnett Quad 400 offers a crossbow of 150 lbs, and 345 feet per second. It can be bought for a little over $300 but you may have to get a rope cocking device or cranking device seperately. I don’t believe it is included in the package deal. But look over their entire lineup and see what one would suit you the best.Good luck!
Here is a link to the Barnett line up-
http://www.outdoorsexperience.com/barnettquadkit.html