The GAX100B-1A is apparently discontinued and sold out everywhere else.
We recently noticed that Amazon is selling the G-Shock GAX100B-1A directly (i.e. “Sold by Amazon.com”), meaning that it includes a Casio warranty. The GAX-100B-1AJF and all other GAX-100 models have a discontinued status according to G-Shock Japan, and it is sold out in the U.S. at other retailers. This may be the last chance to buy it at a discounted price with a full warranty.
The GAX100B-1A is a G-LIDE surfing model from 2016 featuring tide and moon graphs and a thermometer. It shares the popular large case style of other series like the GA-100 and GA-110. The approximate battery life is three years on two SR927W batteries, which is longer than the two year rating of the GA-100/110 battery. Other features include 200-meter water resistance, magnetic resistance, world time, 1/100-second stopwatch, 24-hour countdown timer, 5 daily alarms with 1 snooze, and auto LED light with adjustable afterglow.