It doesn't take a hydraulic tool for this size, just a mechanical Nicropress tool. I doubt HD sells them, but West Marine does (sorry about the long URL):
http://www.westmarine.com/webapp/wcs/stores/servlet/
ProductDisplay ?storeId=10001&langId=-1&catalogId=10001&
productId=72020 &catalogId=10001&classNum=10900&subdeptNum=11208&
storeNum=2
Either of the 2 sizes shown on this page will swage 1/8' wire (the size typically used in fitness equipment, with a breaking strength of 1500 to 2000 lbs).
The best deals on 7x19 vinyl-coated galvanized flexible wire rope are at
http://www.mcmaster.com/
Look at Item Number 8912T51.