Yeah, definitely. And it's light and easy to transport.
http://www.harborfreight.com/3000-lb-capacity-lightweight-aluminum-racing-jack-91039.html
Sometimes it goes on sale for 69.99 or even 59.99, so keep a look out!
There are coupons in Motor Trends (car and driver, I think) for $59.99.
Oh, very nice! I didn't know this. Sometimes on the website they will just go on sale randomly as well. Also, if you join their e-mail newsletter you get coupons via email!
For peace of mind I make sure to always use jack stands when I work under the car. I'm just paranoid like that.
I bought a craftsman low profile one for $59.99 The pin fell out after about 8 months. I took it back to Sears, but they don't offer lifetime warranty on their floor jacks. But since i kept the box, it had a shipping tag on it. So through the shipping tag, they determined that it was within the 1 year warranty. They ended up giving me a brand new one.
I wouldn't recommend getting a craftsman.