<< So what's the difference of buying monitor from local and online? >>
1) Unless you get a monitor where the vendor will cover the shipping charges to get a monitor back to them -- Onvia is one of the few that covers the shipping and 2) Unless you get a company that has a warranty like KDS -- which is quite a generous warranty, you'll be stuck having to pay approximately $40 is shipping charges to get your monitor back to some destination. Purchasing locally allows you to return the item that same day and get your credit back.
Yes, I'm all for saving a $100 wherever possible. However, my latest dealings on a on-line monitor purchase that went bad were less than pleasing. It's been two months since I made the inital purchase. I'm waiting on my credit to my credit card. This has cost me money in interest charges. Plus, it took me 2 calls to get the monitors picked up each time. Even though Onvia issue call tags, they were not acted on and after two weeks of my monitor sitting in my house near the front door awaiting UPS' arrival, I had to make another call. Yes, it's nice of Onvia to pick up the shipping charges, but between the interest on my credit card and having to walk around monitors waiting to be picked up for over a month along with my time making the calls to customer service -- I've lost more than the $100 I would have saved. Lots of people don't have money to burn, but time is also money.