There's a coupon in this month's Automobile mag for a floor jack at Harbor Freight for $60. Its low profile, you twist the handle to release, and works fine.
I have 2 jacks. And having 2 makes putting the car on jack stands x10 easier. If you are lowered, you absolutely need 2.
2015 F34 328iX GT Glacier Silver
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red