SB is so right. A “bargain” or low price is not much help if the instrument needs to be repaired. Finding out what the cost for repairs will be is very hard to do if you can’t actually see the guitar.

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A bow in the neck can be a minor, or serious problem, depending on the guitar, and the degree of ‘bow’.

A ‘bow’ is just what the name implies. A curve in the neck. This makes the guitar harder to fret, and effects the tone as well. It is a problem, but it is fixable, most of the time. More serious is neck ‘twist’, which in most cases, means a neck replacement.

If you have a ‘forward’ bow, then you must loosen the strings, then carefully tighten the truss rod 1/4 of a turn at a time, then check the neck between each turn. Re-tighten the strings, fret the low and high ‘E’ strings(one-at-a-time) at the 14th fret, and check the fret clearence all the way up and down the neck.
The string should be relatively straight all the way up and down. If the truss rod feels like it takes a lot of pressure to turn, STOP! You have reached the end of the adjustment range, and further tighting will damge your neck beyond repair. Take it to a professional lutheir.

For back ‘bow’, just loosen the rod and check the strings until you get it where you want.

If you are unsure how to do a repair, it is best to go to a good luthier and have it done.

If your guitar has no truss rod, the neck will need to be steamed straight. It’s hard to find someone who can do this nowadays, and it is very expensive, because the frets will have to be removed and replaced. It may be cheaper just to replace the neck.

Good luck.