I would have thought that people would've posted this by now, but I couldn't find it in the search.
Only Fools and Horses Complete Boxset £39 at Virgin Megastores, well, Zavvi now. 10% off that price with student card or Virgin Credit Card
It's the seven normal series boxes bundled together in a cardboard box, I'm not sure if there's any extras.
They also have Sharpe Compete for £29
Okay, now the price has changed to £34.99 online as well, so even cheaper!