The cheapest 3D TV found on cheapism.com
The Vizio E3D420VX is a bargain-priced 42-inch 3D TV with lots of extra features, including Internet streaming. Reviewers are impressed with the 3D functionality and color accuracy is quite good. Vizio has a reputation for making good, affordable television sets. The Vizio E3D420VX is a bit pricier than some of similar size sets, but it's one of the few 3D TVs that fall into the Cheapism price range at 729.99 US$ (official price, some discounts are possible).
The Vizio E3D420VX is a passive 3DTV set, so the needed glasses are very cheap too! Two pairs of the lightweight non-powered glasses are included in the price. The negative points about the E3D420VX is its 2D picture quality that falls a bit short of competitors, as its black level is more dark grey than pure black. It has also some problems reproducing 1080p/24 cadence and off-angle viewing is to be avoided.
Official price: 729.99$. We found several E3D420VX on Amazon starting at 620$. Some new sets are on sale on eBay from 674$; refurbished ones from 529.99$.
In the UK, however...
Looking for cheap 3D TV in UK, we found a small but correct 32" set named LOGIK L323ED11 at Currys for 399£ (+ 4 £ for home delivery if your car is REALLY small). Check it here; this offer may last only to end of 2011, however.