The C300 is no longer on sale. If you're still interested in a similar machine, check out the Lenovo A series's A700, a machine with fairly similar price point as the C300, C305, and C315.

The Lenovo C300 was an all-in-one desktop solution produced by Lenovo which has is currently no longer in production.  It was succeeded by the C305 which includes updated processor and graphics card, but both are now about 2 generations old in terms of computer tech (Athlon II X2 etc.)  These entry-level All-in-one has option of TV tuner, decent GPU offering, and overall good RAM selection to let you multitask and do any basic computing without issue.

Beyond the A700 listed above (which has a Core i3 processor), you can also wait for the upcoming B series of All-in-ones, which includes the B320 21.5" and the B520 23", both of which are more closer to the C300 and C305's 20-inch sizing and styling.  The plus side is, both will also rock Intel's latest 2nd gen processor, they will also be wall-mountable and includes 1TB+ of storage for all your media.