felixmizioznikov/iStock Editorial via Getty Images Plus Follow ZDNET:  Add us as a preferred source  on Google. If you're a keen online shopper, especially for tech items, there are a few guidelines you should know to make your experience better and possibly save yourself more cash. Retailer price-matching policies are one of them.  Price-matching policies are especially important as stores compete for our purchases of the same products, and become even more important if you're scouting a popular product, shopping during a busy period like Black Friday, or hunting for a specific color, size, or model.  Also:   I'm a shopping editor, and this is the No. 1 reason I prefer Best Buy over Amazon for tech purchases Most major retailers like Walmart, Target, Best Buy , and more have some type of price-match policy, and understanding the nuances and rules of each is key to becoming the savviest online shopper.…