Biotech stocks have had a rough few weeks. These seemingly unstoppable stocks have followed the market in a sell-off that has some investors struggling to sit still. For instance, the iShares Biotech Nasdaq ETF slipped more than 9% over the past month. Even some players that soared to all-time highs or posted four-digit percentage gains last year have slipped.

But this decline might actually represent an opportunity. Investors are now able to snatch up some stocks at pre-pandemic price levels. Let's check out three biotech stocks that each have dropped more than 28% so far from their most recent high points.

Novavax(NASDAQ:NVAX) soared more than 2,700% last year -- then extended its gains into the new year. The stock jumped 186% in the first five weeks of 2021 after Novavax reported data from its coronavirus vaccine candidate's U.K. phase 3 trial.  But since early February, the biotech stock has dropped 46%.

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