Getting meta tags from a page source using Selenium Python

If I look at the page source, for example in Chrome view-source:https://play.google.com/store/apps/details?id=com.teslacoilsw.launcher&hl=en. I also don't find a <div> element with attribute @itemprop and value price.

So your XPath is completely wrong. Also browser.find_element_by_xpath() returns an element and you want to extract the attribute value of @content. You should then use next:

priceValue = browser.find_element_by_xpath("//meta[@itemprop='price']")
print priceValue.get_attribute("content")