Recently I bought a pair of coaxial strippers at a hardware store on clearance for $7. This pair usually retails at $20/25.
They have the basic coax strippers, plus regular wire cutters and strippers. A pretty versatile tool.
It is designed to strip 75 ohm coaxes such as RG-6u, but the sizes are so similar it ought to work for 50 ohm (ham radio) coax E.G. RG-8x.
To strip your coax, insert the cable into the correct slot, then clamp down firmly on the handles. Spin the rest of the cable around a couple of times to cut the rubber coating, not being so aggressive as to cut the shielding.
Pull the coax out of the tool, and you now have a nicely stripped cable.