Non-VESA mount is $181 http://www.ergopro.com/ESI-ENCLOZE-non-VESA-Monitor-Conversion-Bracket-p/ma-esi-encloze.htm
It doesn't make sense. You buy some monitors on a good sale to save... $100??? and spend $150 to get the mounting brackets...
Those mounts I linked do work with VESA, so technically they can be mounted by VESA with that device for 21.99. Why not get a matching set of 4?
Another cheap option. but how to drill holes? u telling me, that i need to drill holes on the back of my monitor? http://www.ebay.com/itm/Vesa-mount-Adapter-Monitor-DELL-ST2420L-ST2320L-ST2220M-/190544923463
No you don't drill holes. You click it into the desk mount on the monitor after screwing it into the VESA desk stand for dual monitors or such. It simulates the factory stand.
The adapter is the 21.99 item. Those make it so you can hook it into your desk stand in the desk stands VESA holes. VESA is just a fancy word for holes that are either 75mm apart or 100mm apart (used on larger monitors). So you have to buy a desk stand that is VESA compatible (all are), and then an adapter for each monitor to mount them onto the VESA desk stand. Just my personal opinion, but I'd buy 2 more of those monitors so you have a matching set of 4. Looks so nice to have matching monitors. Better act fast before they are gone though, if you decide to do this. Plus then you'd have a matching set for a firepro 2460 if you decided to go with that card.