If they want to provide a discount for all items selected, that is fine. 

I should clarrify, i was just comparing the price of a retail vs a discounted unit ive recently purchased.

There is a lull in their business sometime around September, and if you can possibly schedule a replacement then, they will sometimes give you a discount of one or two hundred dollars a system, just to keep their techs busy. 

Maybe you offer CA services or find some other way to get some compensation for your time, or you sell them rights for individual use at a discounted rate as an olive branch and to recoup some of your costs.

If you asked me to install carpet in one of your worst rentals, then asked me to discount the labor, I could do it and still make a living.I would specify that you are asking for a lower quality job in the contract and if you agreed to it, I'd do as asked.

I believe Groupon has a discount when I signed up

The lease is just a regular lease, however, there is a subsection that says that the leasee gets $100 monthly discount on the rent to take care of the property repairs.

If you want to go to their Expo coming up in August, message me and I can give you a promo code to get a good discount on your ticket.

I can and have offered discounted labor because I have experience in several areas but for whatever reason that doesn’t interest folks.

Flipping is nothing more than making margin on a product after buying at a discount and adding value to it.