The cheapest place I've found the Jumbo at within the UK is
fenixtorch.co.uk - there a couple of other online sellers at that price, however I've bought lots of Maxpedition from these guys and can recommend them through experience. Ordering before 3pm usually means next day delivery included in the price too
If you don't mind waiting for international postage, you can probably save a few quid by using Marc at edcdepot.com. Lot's of good feedback about Marc and he's still a banner advertiser here I think, so you'll be supporting this site
I reckon one of the above is your answer if you go for new
I only got my Jumbo yesterday - so you can't have that
)
Good luck with the hunt!