According to my old Blue Book (#32) they are worth $110 to $295 depending on condition. The extra mags would be in addition to that. I don't know what they are going for.
Blue Books, even the newer ones, often miss a changing market as their values are based on historical data.
These Nylon 66's are getting pricy. They are great, nearly bullet proof rifles. Just don't take one apart unless you have another close by or a good schmatic for reassembly. Don't ask how I know that.
DF