Steven Barnes
its always best if you can get all the items from one source there is no such thing as trade prices anymore anything available is on the internet for anyone to buy if your plumber or builder supplies matierials he will mark up a profit margin this covers his time ordering and collecting and also any warranty call backs if you supply the matierials and something goes wrong expect to be charged the time for repair or replacement of faulty goods if the goods that you supply come broken or with parts missing expect your builder to charge for any delay
