Not all stocks are expensive right now. These two look extremely attractive.

The stock market has pulled back a little bit, but the S&P 500 , Nasdaq , and most other major benchmark indexes still sit within a few percentage points of their all-time highs. The average P/E ratio of an S&P 500 stock is roughly double the historical average, and it can be difficult to find attractively priced investments.

Having said that, there are still bargain stocks out there that could be excellent opportunities for long-term investors. Here are two -- down by 67% and 22% from their 52-week highs -- that are worth keeping an eye on.

A major overreaction

After it released second-quarter earnings, The Trade Desk ( TTD 0.83% ) dropped like a rock. And after falling nearly 40% the day after

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