2 suggestions:
1- Get online where the real bargains are on the internet and it is mostly tax free in the US. It is extremely rare to find a brick and mortar bargain that can beat the lowest internet price, especially as most have local sales tax on over the counter sales in the USA. So even if you find the same price in a store, the sales tax adds between 3 and 10%, erasing the bargain.
2- Post your question on the Casio forum f17
https://www.watchuseek.com/f17/ where the Casio fans hang out with the best knowledge of what is available where, worldwide.
Casio G-Shock
BTW, nothing is cheap in Japan (or China). The internet is where the bargains are. Hong Kong is a possible exception, but one needs local knowledge to best the internet bargains. I was stunned to see the high store prices in Guangzhou and Shanghai. No bargains for foreign tourists, and then you get to pay duty in your home country when returning.
Also many Casio are JDM and are only sold in Japan. Just received a JDM Oceanus Waveceptor model OCW-S100-1 from Chino, a dealer in Tokyo who had the lowest price last week worldwide online. Paid no tax, no duty, no shipping. Got it for way below MSRP.
The internet is where it's at for watch bargains.