The Ninja Slushi changed my whole summer last year. It was the first home slushie machine to make bar-quality frozen drinks accessible to the American kitchen, back patio, and pool party. And so last year became the summer of daiquiris. (It was also the summer I got invited to children’s birthday parties, so I could make the nonalcoholic kind of slushie.) Either way, the Slushi offers something that feels increasingly rare in these times: carefree adult fun. Fun is even more carefree when it’s cheap, and this $200 deal on the Ninja Slushi is the cheapest that this machine has ever been—around 40 percent off last year’s retail price. This is actually, kinda, the price I always hoped the Slushi would be. Small dreams sometimes come true, I guess. Photograph: Matthew Korfhage Photograph: Matthew Korfhage But in some ways, I’m not surprised the price has come down. Ninja has since come out with two newer, snazzier, and frankly better machines. The Ninja Slushi XL ($350) that arrived this spring offers a bigger capacity—96 ounces, compared …