Picked up the NOCO GB70 over Black Friday for around $180 plus taxes, it's a nice hefty unit with one of the best outputs in its class. Also saw the GOOLOO 4000A on sale, either of the two are top of the tests here:
Also have an old Anker 600A, it's saved me a couple of times and has jumped a 3.0L Mercruiser with a rather low marine battery, but recently failed to jump a 3.5L MDX with a dead battery. The boost/override function is a must, it's a total pain in the ass to work without it with a dead battery.