
20 watches that match on case size, movement family, and price band. Sorted by how close the match is.
The closest alternative to the Casio SPS-300 is the Timex Expedition Sierra 40mm Recycled Materials Fabric Strap Watch ($139) — common cross-shop and Same size. If price is the constraint, the Timex Expedition Scout 40mm Fabric Slip-Thru Strap Watch - TW4B15500 at $50 covers most of the same brief.
Established brands covering the same brief at a comparable price: same case size, similar movement family. Often the deciding click for a new buyer.
If the price is the only thing keeping you off this watch, these get you most of the way there for less.
Where the same idea goes when budget isn't the constraint: luxury upgrades and step-ups.