Depends what sort of straps you're looking for but I've found more options on different lengths from some of the producers at the slightly higher end, such as Bulang, Atelier Romaine, etc.
Refreshingly, I bought a new Zenith recently, and it was only by chance via a diect enquiry to Zenith before the purchase with a couple of questions about the model, and them sending me back the spec sheet, that I found out the strap the watch comes on is actually also available in a size small as well as the standard regular. I've no idea why Omega et al don't offer similar choice?