OP
millwall ken
As IQ has said.Lol, welcome, what's your favourite breakfast cereal?
Depending on what you're buying, each wholesaler will have different deals, MK gear cheap at one, conduit expensive (example).
So here, you'll get a string of different answers but none definitive!
The best thing to do is to visit a few near where you're actually working. However a lot of contractors also like to use one/two who are local to their home/office etc. Especially if you intend to set up an account with them. Depending on the work that you will be doing I'd recommend using one that ain't gonna run short of your 'bread and butter' gear. NOTHING worse than running out of cable at 4pm on a saturday afternoon.