Amazon’s Prime Day sales event kicks off tomorrow in earnest, though deals have been piling on early for well over a week. A new discount that’s coming in pretty hot is a $50 discount on Google’s latest phone, the Pixel 7A, which is now available at Amazon and Best Buy for $449. The excellent midrange phone offers a nice sampling of what Google’s fancier Pixel 7 flagships feature but at a much more modest price. It’s our top pick of phones around $500, in part due to its fast 90Hz…