I hope that Firebird has a V8. I know I can get a similar '00 V6 Firbird for 5k~ off the lot, no trade in. Same for a Camaro of similar year. I really have no faith in dealerships unless you're buying something new. Otherwise, pay a visit to the smaller private salesmen and find one who is honest and likes to deal.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne