Your best bet will be to check
car-part.com and see if you can find anything in a junkyard near you.
If you're looking for wheel covers, I would recommend checking the price for brand new ones on
GMPartsCenter.net. I ended up buying 2 sets of brand new 2009-2010 Vibe 2.4L Base/AWD 16" wheel covers for the winter wheels for our 2009 GTs. Shipping was free. There was an $8.95 handling fee, but getting brand new wheel covers through GMPartsCenter.net was actually significantly cheaper than buying used ones from eBay, Craig's List, junkyards, etc. It was $274.xx for 8 brand new wheel covers (approximately $34.00 per cover)! GMPartsCenter.net always offers discount codes too. They're currently offering 5% off any order over $100.00 through April 31, 2013 with the discount code
SPRING.