I looked around a little, and it looks like you have 2 options. The shop is probably quoting you the cost of replacing the entire valve cover which does have a built in vent:
Valve cover on Amazon
This cover is $100 on Amazon, but they are probably quoting OEM prices + labor, so that might technically be a "valid quote", but it still seems very high. Get another quote before you do anything, or...
Notice the circle on the front of that valve cover. That is normally the part that goes bad because it has a rubber seal that fails. A third party company has started to make just that part:
Dorman replacement PCV diaphram
So, for $20, you might be able to fix this yourself. I'm not sure if the trouble codes need to be manually cleared for this fix or if the CEL will go away on its own.
Even if you want or need to replace the whole valve cover, it might be something you can do yourself or with the help of a handy friend. It's a pretty basic repair.
Note: I'm not endorsing Amazon for auto parts - it's just easy to search and most people are familiar with it. Shop around, or even check local parts stores.