I don't think there is an invector plus model. Invector Plus is the choke system Browning uses on newer shotguns.
100-700 usd
50-550 usd
100-675 usd
With no description provided, the broad range of value is 100-1000 USD.
Its about $550 @ basspro
What gauge and grade is it?
50-500 uSD
0 100-1000 USD and up depending on specifics
Either Invector or Invector+ depending on how it left the factory.
Browning did not make an Invector model. That is the type choke system of the shotgun.
Browning's web site has the current information.