Serpentine belt is $29 from IPD. Tensioner is $64.
To replace both is an hour or so, tops...
$200 - $250 seems reasonable to me...what are they charging for parts/labor?
2016 Tundra Crewmax 4WD 1794
2006 Corolla (165K, Eco Contacts, Castrol Edge 5W30)
2005 MB S600 (84K, Michelin AS3, M1 0W40)
2002 V70-XC (206K, AltiMax RT43, Pennzoil Ultra 5W40)
2002 V70-T5 (181K, IPD bars, Bilsteins, Contis, Mobil 1 0W40)
1992 MB 300E (Sportline - 160K, Yokohama Avid, Castrol Edge 0W40)
1990 4-Runner (V6, 4WD, mild lift - 257K, 31" BFG AT KO, Castrol 10W40)
1932 Packard Sedan (straight 8, dual sidemounts, original paint and interior, Shell Rotella 15W40)