EDIT: As pointed out in comments below it is slightly cheaper at Amazon. G7900 for $99 however still seems like a good price.
Anaconda are selling a Casio GAX-100 G-Shock Tide Watch for half price, from a quick search it seems to a good price.
They also have the G7900 for $99 down from $199: https://www.anacondastores.com/clothing/clothing-accessories...
Also 5% cashback available through Cash Rewards.