LCD on ebay. search "great deals on ebay" on the forum. There was a post a while ago. One seller from China managed to get the LCD to me (US) in 7 days. Other parts, ebay is ok but specific stuff you will need to buy from larger suppliers. I hate them all. I'm still waiting for my stuff from allied electronics after 20 days. There is one back order item, just a damn box, took this long and yet to see it arrive in the mail.
If I want stuff quicker than 3 weeks, I buy from dipmicro.com from Canada, takes 2-5 days, on or off ebay on its own website.
The weird thing, I really really wanted a green LED, for some reason I didn't have one bright enough. Paid premium at radioshack store and it's been almost 2 months, the LED is still sitting in its unopened package.
Try to avoid impulsive purchase and plan on what you need before you buy.