Heh, it just so happens I went on a bits binge the last couple weeks!
I order bits both from The WarStore and from http://www.bitzbox.co.uk -- Bitz Box usually has a better selection and is a mostly a little bit cheaper, their shipping to America is reasonable at $5, and they have fast response and great customer service via their forums; The WarStore does have a few things cheaper, has faster and slightly cheaper shipping for me (since we\'re both in the States), and I\'ve had equally great customer service from Neal and his people in the past.
Any time I need bits, I always check both sites thoroughly to see who\'s got stock and who will have the best deal for me, and I\'d recommend to anyone else to do the same: use both stores. In fact, I just placed a BitzBox order at the end of last week, and I\'ll be placing a WarStore order either today or tomorrow! But I\'ve also bought from each before, so I feel confident recommending them even before I\'ve got my stuff this time.
Finally, you can also check out this eBay seller: http://stores.ebay.com/Hoard-O-Bits -- I just won a bunch of their bits auctions and/or BIN items over the last couple weeks. I haven\'t used them before and it\'ll be at least the end of this week before my bits could arrive, but they do a great combined shipping discount and have also done a great job so far at customer service -- they let me go 9 days total between my first BIN purchase and waiting for my last auction purchase to close so that everything (10+ sales, total) could be combined as one; and when I just missed one auction item because it went way higher than it should\'ve*, I wrote to them and asked them about more availability, and the next day the wrote back to let me know they\'d put up a new one as BIN for me (and at a reasonable price, too!). So far, I\'m impressed.