COstco in Manchester had the following in :
Sony KDL-40S2530 (£822)
Tosh 37WLT58 (£857)
Tosh 42WLT58 (£1250ish)
37" Samsung (£860ish)
These are all I can remember. There were a few Sony 46" displays (eg W2000 for £1700 or 46S2530 for approx £1400).
All prices are inclusive of VAT and Costcos excellent 3 yr warranty.
I also think different Costco stores carry different stock..
Phoning is the best way to determine what they have..You have to be a member though..
With regards to membership, you can join as an individual member (not trade)..It'll cost around £25 (as opposed to £20 for trade)..To be honest there isn't any difference between the two, just longer shopping hours allowed for trade members...Just take two forms of id (bills) and you should be able to join on the spot!