Just a quick opinion.
While Amazon and eBay can sell you the cheapest parts, the most important
feature you should be looking for is customer tech support and warranty fulfillment. I seriously doubt that someone in a garage sitting at a computer who drop ships an item to you for a few bucks will know anything
about said product or will even be willing to help with any questions that you may have.
I have known Randy at Best Converter for 8 years. He is an upstanding guy who has the knowledge and experience to send you the right product for your needs and stands ready to help you with any problems or questions that you may have.
His prices are in line with many internet sites, but his assistance is invaluable. I would choose to support his business over any unknown internet seller for this feature alone, even if it costs a few bucks more than that guy in the garage!