This one on amazon looks pretty good and has great reviews: (4.5 stars out of 39 reviews)http://www.amazon.com/Ergotech-Triple-Horizontal-Monitor-100-D16-B03/dp/B001NPEC5A/ref=cm_cr_pr_product_topComments from one of the reviewers:"I have 3 Dell 24" U2410 monitors (14 lbs each) hanging on this stand. No problem at all. There is even enough room to tilt the arms in so that the monitors form a concave arc."
It looks like a quality product and is less expensive than most.
If this does not work out for you I suggest doing searches on amazon.com for the keyword 'triple lcd'. It appears they got some other good stands on there.