I love the Tie Bar. The selection of ties, pocket squares and accessories are great and the prices are unbeatable. Ties from $19 and pocket squares from $10.
One of the best features on their site is they allow to you to mock up what your shirt selection will look like when paired with various suit colors. For those that need to visualize before you buy, this is a great feature.
Here are some options from The Tie Bar
Fashionably Correct 