Taken a look at electronics wholesalers? I don't know of any in your area but here I found a few that are friendly to consultants with low volume accounts. Much better prices than big box stores.
To give you an example I got an account at supercom.ca. They're easily 30-50% off list price at Best Buy (generally 40% off on tvs) They're a local parts wholesaler. Returns sometimes suck because they don't always just pull something off the shelf for you. When I bought their first run of Samsung CLP-300N printers I had to RMA one, but they didn't get me my return until they had a palette of 16 to return to the manufacturer. That took 5 months.
Upside: Prices, having staff know what you're talking about.
Downside: Yearly fee, must have had a registered corp for 1+ years.
Bonus: List the item as a 'demo unit' or and you can skip sales tax.
Personally I'm waiting for SED before I buy a new TV.