Sell-offs make everyone a little nervous. But the best thing to do is stop, take a breath, and refuse to panic. If you panic, you might sell a great stock or miss an amazing opportunity. Right now, the climate of rising interest rates is proving chilly for investors. Tech stocks are paying the price since the sector is sensitive to the idea of higher rates. But let's not put every stock in the same basket. Some solid companies with fantastic long-term prospects are dropping. You know what that means -- it's time to scoop up those shares, and at a good price.Amazon$Amazon.com(AMZN)$ (AMZN-7.56%)-- which was down about 7.5% in today's sell-off -- is one of them. Down 30% this year OK, let's be realistic. Amazon hasn't exactly been the best pe