Newegg is a best bet. If you need help finding a good deal on one let us know what a bigger screen is like does that mean 15" or 17" and a price point for you.
Well what price point are you looking at, the biggest screens I have seen are from Alienware which are 18.4" for about 2k. 17" though I am sure we could find in your price point.
Are you needing to be portable with that big of a screen? Maybe a all-in-one would be your best option?
Well here are three models in three different price points but they are brands I specifically trust, hope it helps especially since you did not provide us what your budget is.