I'd go to the dealer too, or at least find something "compatible".
Is this the original fluid? If so then I'd just chalk the cost up to routine maintenance. A cooling system flush once in a while is still a good thing, last I knew of.
2011 Toyota Camry, base, 2.5L/6MT, 193k, hers
2010 Toyota Tundra DC, 4.6L/6AT, 155k, ours
1999 Toyota Camry LE, 2.2L/4AT, 214k, his