If the launch of Halo: Campaign Evolved has you feeling nostalgic, Walmart has the Gel Blaster Halo Plasma Rifle on sale for $59.50 (usually $99.95). This faithful replica of the classic Halo weapon fires harmless, non-toxic gel balls at a range of up to 100 feet that dissolve. Unlike the in-game version, when the battery runs low you can charge it via USB-C, rather than chuck it at an unsuspecting Grunt.