@Gary Wallace
Hi Gary, I feel your pain on this one.
Here in Massachusetts, state sanitary code requires a stove in a rental, but not a refrigerator - go figure that one out. However, if you list the appliances in the lease as being the property of the owner, then it is your obligation to provide what is written in the lease.
Just had a gas stove delivery today after three weeks, and two other deliveries are taking 30 days for a new stove and fridge. The problem is scarcity of inventory being blamed on covid for production shortages from three months ago. It is scary when you walk into Home Depot and the door section shelves are totally empty. It's not just appliances, but right now a lot of building materials are in short order.
I think having a candid conversation with the resident is the best course of action moving forward. Give them some options. Let them know the situation about back orders. Look for other out of the box solutions like Craigslist or local Facebook groups looking for a used stove. We always try to keep a few appliances in storage just in case if a tenant cannot wait. We have been lucky that our residents; given the option, were happy to wait for new if it took a few extra weeks instead of taking the backup unit out of storage. Being their choice in the mater, we did not offer any rent discount. If they did want the rent discounted, we would get them the backup stove before end of business that day. We are fortunate enough to have the appliances, the trucks, and the staff to back up our offer.
We had a resident's fridge breakdown a few months into covid, and he worked at Lowes. He was able to get a new fridge from inventory in the store from the back room and get the employee discount. He bought it and we reimbursed him for it. We gladly picked it up in our truck and delivered it for him, and saved about $300 on a stainless French door fridge with an icemaker, which is what he had to start with.
As far as a discount, I would make that the last option. See if you can offer one of the other options to get them a used, or wait for the new. Then let them decide.
The thing I hate about used appliances, or trying to fix them, is that you could spend within a few hundred dollars of a new machine just trying to fix the old ones. And then, you are still stuck with an old one that has been repaired. One more repair and it becomes obvious that you should have bought the new machine.
If I were to offer them any discount at all, it would not exceed the cost of a new stove. Afterall, that is the only thing that is missing, right? I am sure you could find them a backup with a little effort, or even pull it out of another rental that is vacant or under repair. Also try checking with the other landlords you know. They may just have one kicking around in storage they would loan you or sell it to you cheap until the new stove comes in.
There are also a bunch of other good posts and ideas here too. Gotta love the BiggerPockets community!!!