When to buy?

Hi,

We are looking to upsize our van from a 2 to 4 berth (with fixed bed) this year and we are open to a new or used van.  We've had our van valued and looked round our local dealer, where a new Venus 540/4 seemed the best deal.

Is there a time of year when you are likely to get more of a deal on a new van?  If so, when would this be?  Is this the same for used vans?

Thanks,

Jo