I know this is near zombie status, but still an issue worth addressing.
I have that Harbor Freight sharpener that
@chainsawmaster1000 mentions above. It does a decent job for the money, but for me it served to make me decide I liked a bench grinder enough to invest in an Oregon bench grinder. It is more adjustable, more consistent, and
much sturdier. And, yes, much more expensive.
For an inexpensive solution that does an excellent job, I suggest the Granberg G106B. It's under $40 on Amazon as of today (plus files). It serves as a portable solution as well as one for home.