I actually live in flip flops year round, but even if you don't, you are still going to need a pair for your final weekend of Summer, which is coming up faster than you want to believe.
Here are a few for you to consider:
You really can't go wrong with a pair of Reefs. I have two pairs, both of which I have had since college. They have been literally everywhere with me over the past 10 years and they are good as new. Well, maybe not brand-new, but you get the idea. You can buy them here for $19.95
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Another great option are Havaianas. They are super comfortable and come in all kinds of fun color options. I also have a pair of these and I love them. A little softer on your foot than the Reefs. I have not had them for ten years, so I can't attest to their longevity, but so far so good. Available here for $10.95.
For a daytime outing, not necessarily the beach, these Jack Rogers Navajo Sandals are everywhere this summer. Available here for $79.
and finally, I had to include these cute preppy flip flops from J.Crew. They are $22.50, but 20% off if you buy two pairs. Available here.