Tripods are the equivalent of using a Ransom Rest for testing a handgun.
Get be heaviest and strongest one you can afford, for the flimsy little Wal-Mart types allow too much vibration when the shutter clicks.
Also, on static objects, set your camera on timer mode so that you do not push the shutter button physically to take the picture. Doing so, even on a tripod, will still blur the photo a little . . . even on a $300+ tripod. An option for using the timer mode is via a remote controlled shutter release (available for higher end SLR cameras).
Another handy "tripod" we all should have . . .
Also purchase a "mini-tripod." These little fold up tripods don't cost but $30-$40 or so and are only a few inches high. They pack in medium sized camera bags and thus you can always have a tripod when you need it! Being short and sturdy, vibration is not a problem either, when using it via timer or remote shutter control. They come in handy a lot . . . and I keep one in my fanny pack I hunt with, just in case!