Except for heated PCV valves, the vast majority of PCV valves and their associated hoses should not cost much more than about $120 or so- even if you source these parts from a dealership, which we strongly recommend you do.
Of course, this is not the same as saying that all aftermarket PCV valves and hoses are bad or substandard because many manufacturers of OEM parts also supply the aftermarket. However, what we are saying is that even though PCV valves and hoses for most applications are available from many online retailers for under $25 or so, the problem with sourcing parts via the online route is that you can never be sure of what you are getting for your money.
While you might receive a high-quality PCV valve, it is more likely that you will receive a cheap knock-off of a genuine part that may or may not work as expected- if it works at all. Therefore, we recommend that you purchase critical parts like PCV valves and associated hoses only from reputable sources such as trusted parts outlets or dealerships, both of which typically offer meaningful warranties and reasonable returns policies.
Note, though, that the above price estimates do not include labour and other professional charges if you elect to have the PCV valve on our engine diagnosed and replaced professionally. Nonetheless, in the majority of cases, a professional PCV valve replacement should not cost more than about one hour’s labour, plus the cost of the part(s) but note that labour and other professional charges, such as diagnostic time, vary between workshops based on your location, as well as on your vehicle's make and model.
Based on the above, then, we recommend that you obtain repair estimates or quotes from several workshops near you that include all relevant charges to avoid possible hidden costs or a repair bill that could be higher than you expected, or are willing to pay.