However, Joly also warned of "external pressures" such as deflationary pricing, weak post-holiday demand for consumer electronics, lower interest in extended warranties. The bottom line is that Best Buy's enterprise comparable sales will be flat to down by low single digits, and non-GAAP operating margins will shrink by roughly 0.3% to 0.5% year-over-year. That's why The Motley Fool's chief investment officer just published a brand-new research report that reveals his top stock for the year ahead.