We're talking about 2000 and newer models with the 2.7L engine or
the S?
    Depending on mileage, the base Boxster runs from mid-to-high 20s
for 2000. Some people advertise in the 30s but these cars are too
plentiful to pay a premium for one. The 2000 Boxster S runs from the
low-to-mid 30s. The newer cars, especially those still within factory
warranty, fetch more.
    Personally, I'd avoid a high-mileage Boxster for now, no matter the
savings. It's easy to find low-mileage, well-cared for cars and we
don't know how well these engines handle the upper ranges yet.
    Emanuel