Spark plugs and coolant, I don't think I would go for " cheap " .......... I would go for " correct " and Toyota fluid, well, maybe Toyota is the best place to get that from anyway !
Skimping on essentials such as these might prove a little fatal in the long run.
My plugs will last 60k miles and the correct coolant, well, for a helluva long time I know.
Malc