Try Satellite Parking Systems at LGA. It's cheaper than the overpriced Avistar.
They provide free shuttle service.
718-478-2200.
www.satelliteparking.com
Sometimes the gate is closed if you're getting to the airport extra early in the morning, so take the phone number. I had to do this last time. They quickly opened the gate for me.
By the way, I have a 'park 1 day for free on a 3 day min stay, or 2 days for free on a 6 day stay' cert.
Want it? E mail me.
Dan
[This message has been edited by dhammer53 (edited 10-24-2002).]