I bought a house with a old grill on the patio (grill post is cemented
in) that has a gas line from the house (natural gas I think). The
grill however doesn't work and I'm looking to replace it. Where are
some good sites to find some
good & inexpensive natural gas grills? Most of the grills I find are
propane tank grills, or over 1000$ which is way over my limit. Thanks

You can buy a cheap propane grill and convert it to natural gas:

http://www.mobilehomerepair.com/article18gasgrill.html

I used a fantastic Natural Gas grill on an exhibition at Earls Court
London last year. I cooked gourmet outdoor foods for the Visit Britain
stand. I cannot remember the name of the equipment but it was the best
I have ever used. Visit Britain own this so they would know. I listed
the recipes on my site at http://www.personalchef.uk.com It may be
possible to get info from them via the links.