It really depends on the type of straps you'd like. There's a big market out there for the 22 or 24mm Panerai-ish straps, but the market for 18mm straps for dress watches is smaller.
I've had good experiences with Watchbandcenter, with Martu straps, with Colareb & Kelaran on ebay, and with Hirsch. The best experiences I've had are with bespoke straps though - Casa Fagliano, Camille Fournet, and 2 local Singapore craftsmen who are very good (but with corresponding prices to match). Overall, I've found Hirsch to be pretty good bang for the buck, plus they have short straps too, which is a plus.
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