Hi, for what the internet can provide you certainly have to search for bargain and deals.
Most of my supplies come from RS (free next day courier, 9.00AM), or E14 (farnell)(Courier sachel free if order over $50), and just down the road, like 5mins, Wiltronics who have Arduino, and good supply of components, and online shopping.
If there is no hurry, I'll got to ebay, I always do a search "arduino" and look at Auction with free postage.
Surprising what you will eventually end up with.
Tom..... 