Casio G-Lide Surf GBX-100 (GBX-100, GBX-100-7). Current Prices, JDM Listings, Market Analysis
The Casio G-Lide Surf GBX-100 is a sport-focused G-Shock variant built around surf and outdoor utility, carrying reference numbers GBX-100 and GBX-100-7. Tonbo tracks it because JDM supply on Yahoo Flea is active and US buyers searching for GBX-100 for sale frequently overpay relative to what the Japanese secondary market actually clears. The current US median sits around $150, with a wide spread between $110 and $200 depending on condition and seller. That spread is worth understanding before you buy.
Current US Market Value
The GBX-100 price in the US currently centers on a median of $150, with the middle 50 percent of transactions falling between $110 and $200. That said, the comp pool here is thin. This estimate is built on a sample size of three transactions, which means individual outliers can pull the range in either direction. The comp quality is rated 🟠Estimate only, so treat these figures as directional rather than definitive. Until more US sales data accumulates, the Japan market provides a more reliable read on what this watch actually trades for in volume.
Active JDM Listings
Japan supply on the Casio GBX-100 is healthy right now. As of mid-June, Yahoo Flea is showing multiple concurrent listings across a range of conditions and prices, which is a good sign for buyers willing to source directly. The spread from ¥13,000 to ¥39,280 in a single day reflects real condition variance, not just seller optimism.
- ¥13,000 on Yahoo Flea, described as showing no noticeable scratches or stains
- ¥18,800 on Yahoo Flea, listed as new
- ¥18,980 on Yahoo Flea, listed as new
- ¥19,000 on Yahoo Flea, described as no noticeable scratches or stains
- ¥39,280 on Yahoo Flea, described as close to unused
The cluster of new and near-new listings in the ¥18,000 to ¥21,000 range gives a reasonable floor for what a clean example costs to source. The ¥39,280 listing at the top is an outlier worth monitoring but not chasing without more context on what differentiates it.
Recent Alert History
No strict or opportunity alerts have fired on the Casio G-Lide Surf GBX-100 in the past 90 days. That is not a red flag. It means the model has not yet generated a clean signal where a verified low-priced JDM listing cleared clearly against the US comp range. With a thin US sample and moderate JDM volume, the model is still building the data foundation that makes alerts reliable. You can see how Tonbo's alert tiers work at tonbomarket.com/signals.
Japan vs. US Price Gap
At current exchange rates, the JDM cluster in the ¥18,000 to ¥21,000 range converts to roughly $120 to $140 USD before shipping and import costs, which puts well-sourced Japanese examples at or slightly below the US market median of $150. That gap is narrow but real, and it favors buyers who can navigate proxy purchasing or use a consolidator. The main risk here is condition variance. The same listing description, "no noticeable scratches," can mean different things across sellers, and with only a handful of US comps to anchor value, a watch that arrives in worse condition than expected has limited resale cushion. Browse recent cross-market deals at tonbomarket.com/deals to calibrate expectations on landed costs.
Track Casio G-Lide Surf GBX-100 on Tonbo
Tonbo is free to start. The Collector tier at tonbomarket.com/dashboard gives you a five-model watchlist with no credit card required, so you can add the GBX-100 and start watching how Japanese prices move against the US comp range. If you want real-time Discord alerts the moment a GBX-100 listing hits a signal threshold, the Member tier runs $10 per month. For a model where comp data is still thin and the Japan-to-US gap is modest, tracking beats guessing.