whats a good price t pay for a 08 r8 4.2 12k fully loaded

if you have enough money to afford one of those does price matter that much?

Depending on the trans etc. between $87,000-93,000.

The value also depends on where you live. They sell for more in California than Maine. Check KBB.com and Edmunds.com for prices in your area.

Depends on the milage and condition, starts around high 90's for less than 6000 miles, drops to low 90's for 6-10000 miles, then drops from there depending on miles and condition. Can vary depending on location. However only cost 1500-2500 to ship anywhere so don't let location stop you.