Sustaining Invisibility

[Amphetryon]

What's the earliest level that a given Pathfinder Character could reasonably expect to remain invisible throughout an adventuring day? How many resources, monetary or otherwise, would said Character need to expend toward this goal?

[Slipperychicken]

Missing Template (CR +3) gives you permanent (Su) invisibility forever, as well as some other goodies like HiPS (through Shadowed) and Displacement. Until you attack or get hit, in which case you're visible for 1 round.