Go to: 1986-88 Pontiac Fiero The Fiero, a mid-engined sports car that somewhat resembles a smaller Firebird from that era, suffered from some initial quality issues. The late-80s GT versions, says Hemmings, look like potentially profitable collectibles. Retail value: $2,500 to $3,000 Values given are Nadaguides.com average and high retail values for latest model year in given range. Figures are rounded to nearest $100. Values are for a representative trim level and option package.