I think finding affordable and chic light fixtures is probably one of the biggest challenges when decorating a home. Here are a few of the sources I have used.
Dining room light:
I bought this light on Ebay and got an amazing deal, $50 bucks; but the seller I used is no longer offering it. Here are some other sources for this light, unfortunately not priced as low as I was able to get it for.
Kitchen sink light:
I found this light at CSN Lighting for about $83.
Kitchen table light:
This is actually a "pendant lamp" from CB2 - $50. It is meant to be plugged into a wall outlet, meaning you would have to string the cord along the ceiling and down a wall. If you don't like that look you'll need an electrician to adapt it to function as a regular pendant light, luckily my husband was able to do just that for me so I didn't have to pay anyone.
Garage lights:
There were some seriously fugly lights on our garage exterior when we bought this house, we replaced them with these beauties from Home Depot, priced at only $32 each.
Here are some other affordable fixtures that have caught my eye:
Urban Outfitters Chandelier - $48
CSN Lighting Capiz Pendant - $55
Ikea FOTO Pendant - $30
Ikea OTTAVA Pendant - $30
Hampton Bay Wall Sconce - $45