Best Buy rises on better-than-expected earnings and optimism over the holiday quarter. Alibaba has a big debut on the Hong Kong market. And CVS Health gets a big new investor. Motley Fool analysts Emily Flippen and Ron Gross discuss those stories and talk Dollar Tree and budget retail.   Thanks Health IQ.  See if you qualify for lower rates! Go to www.healthiq.com/fool www.   GETQUIP.COM/fool for your first refill free!