Where to get the best caravan deals

Hi,

I have been told that the best place for caravan deals is the shows.  There are 2 shows coming up, the Lawns and the NEC.   What are the pro's and cons for buying from each?  Which is likely to give the better deal?

I want to get offered the best deal so that I can go to my local dealer and say, this is what xxx are offering will you match it - so that I dont end up buying miles from home. But I need to know which show is likely to give the best deal.