Home depo has them in tool rental. It's better to rent them if this will be your only time needing them and plus the service them as well. Good luck
They aren't too expensive to buy, and Jimmy is right. Go slow and you'll be ok. Have your support ready to catch the weight once you have it jacked up.
You can purchase fairly cheep ones at home depot. I bought several. Used them about 6 times. Worked great every time. They are a bottle type hydraulic jack and it takes time but you got to go slow jacking the house up anyway if you go too fast it can be pretty darn scary under there
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