Groove Toyota uses machines that flush 16 quarts. BG flush machines. It flushed using the vehicles power to replace the same amount of fluid going in and out. I think Toyota still says the fluid is lifetime, though it looks black at 100k miles in most cases. Groove recommends the fluid changed at 100k miles. Some customers will request it sooner.
Fluid prices are way down now that you can get an aftermarket alternative. We use a Valvoline fluid for flushes now. I'm not sure on pricing/coupons.