I mentioned this on another thread that's not really related, so I thought I'd post it in a more identifiable thread for the UK members.
Costco in the UK are currently selling the Manfrotto 190XB tripod + 804RC2 Head for £88 without VAT. Comes to just over £100 once you add the VAT on. I got one at the Costco in Farnborough, but I guess they are in others. They aren't listed on the Costco website, so it was a nice find when I walked in there!
Seems to be a pretty decent price when I cross-check it with other popular sites