Why would you think that a $80.00 Radiator flush is expensive????
Have you looked at dealership price? They have less experience techs doing the same work and what you paid for a radiator flush you would pay that much just for the labour. Material extra.
Try doing the flush yourself and see how much it cost you? Or if you can even do it.
Plus i belive at Lubeworld you get a 10% discount on your total bill. Try them out.
For reffering a customer to them you also get $10.00 per customer. What better deal do you want.