+1 for Amazon and the internet. Often Amazon is a direct link to the manufacturer.
Indeed, my 300w panel came via Amazon UK, as did my NG anchor at 2/3rds of the price of the local chandlers who I would prefer to support but that is a saving I couldn't turn down.
I used Sun Electronics in Miami. I found their prices to be the best. Additionally their tech support was excellent. I bought 2 Sanyo 250 watt panels for $245. That's $.49 per watt.