So, Simba, which items am I grossly overpaying for?
Check the parts on lotusgarage, for example.
Cam belts: $149.50 ea, not 185.
Tensioners: $156.55 ea, not 182.
Crank pulley is around $170, not $450, and you shouldn't need one unless it's damaged.
The labor is reasonable, but all of the parts have a $20-80 premium on them, and some of them are highly unlikely to be needed. Either the shop is trying to take you for a ride on part costs / parts needed, or they have no clue what is actually needed and are going with the shotgun approach, and hence billing you for their learning curve.