One of the few optically stabilized Sigma lenses for the Pentax K system is the Sigma 70-300mm f4-5.6 DG OS, and this lens is offered manufacturer refurbished with a 90-day warranty for $189 with free shipping at Adorama.
You are paying a premium for the OS (optical stabilization). If you don’t want/need OS, the new condition non-OS 70-300mm f4-5.6 DG Macro goes for $169 with $7~ promotional rewards at Adorama.
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