I checked a couple of GM parts sites and found the rings. It might be a good idea to verify they are are the correct rings before ordering them. I assume "w/o LSI" would be the XFi. And I assume the price is per cylinder. I could use 7 of the "gapless" top rings....
http://www.gm-parts-dealer.com/
http://www.gmpartscheap.com/
There might be other sites too, I only checked a few.
Pistons, rings & bearings, Piston rings
Metro, w/o LSI - 1.0l
List Price : $33.00
Your Price : $26.40
Pistons, rings & bearings, Piston rings
Metro, w/LSI - 1.0l
List Price : $42.82
Your Price : $34.26
XFi decals are available too!