If you purchase an independently reviewed product or service through a link on our website, Variety may receive an affiliate commission. Starting in 1991, director John Singleton releases his debut film “ Boyz n the Hood ” at age 23. Over the next 10 years, Singleton released a loose trilogy with “Poetic Justice” and “Baby Boy.” And now, the Criterion Collection released a premium box set with all three movies on 4K Ultra HD. Available starting at $87.49 (reg. $124.99) on Amazon , John Singleton’s “Hood Trilogy” box set is now available on Blu-ray and 4K Ultra HD disc. In addition, the release is available at Criterion.com and Barnes & Noble for up to 20% off list prices.…