It really depends on your area. Where I live, you don't have to purchase the propane tank. It's owned by the company who fills it. When we need gas, we call them and they come and fill it up. They own the tank and they installed it and attached the pressure regulator to the outside of the house. They also leak tested our gas line to make sure it was good. We installed the gas line ourselves.

Propane burns differently than natural gas so you want to make sure you get a range that's set up for that....

I can't talk about your area or how much it would cost, but here's what we did.
I called all the propane companies, they wanted to rent us a tank & then we had to use their minimum amount of propane, which was an insane amount ($800 per year). So we went & bought our own tanks, 2 x 100lb ones which we can take to the gas station ourselves, or we can have the local truck come & fill them. In the two years we've had this set up, we use about 1 tank every 6-8 months ($90).

DH did all the piping himself & we had it inspected, it was pretty straight forward. We bought a gas stove which had a field conversion kit, which we had to pay someone to come & convert (we didn't have the right tools & they cost more than the service call)
Once we figured out the two tank system it was pretty straight forward.
I love cooking with propane, I never worry about power outages anymore.

Thanks. All good points. I really hadn't thought about being able to run the piping myself, I could probably save some money if its a simply task. Just have them check it at installation. I'll be calling a few companies for prices. Thanks again.

I wasn't even thinking about the fact that you are only cooking with propane and not heating with it. You probably could get by easily with a small bottle. I heat with propane too. During the summer when I am only using the propane for my cooktop, the gauge on the tank does not move at all. I used to have a propane range years ago. I used those small propane tanks like you have on a gas grill. It worked great, was easy and cheap to get filled and it lasted a while.

For the money that will be involved, you'd be better off looking at the induction ranges that can run on electricity. Getting the gas too and from the tank won't be that big a deal, but gas supply companies have minimum requirements, and if cooking is your only propane expense, you're not going to meet minimum for them to deal with you. Buying your own small tank would be the way to go, but only if you are very very handy and can do everything yourself, including changing out the orifices and making sure the regulator is supplying the correct pressure and can troubleshoot any issues with confidence. Otherwise, to actually pay the labor involved in switching over will end up being a lot more costly than just going induction.

For installing the line yourself, we had to go to the Safety Branch & get a homeowner's permit, the inspector was great, he told us exactly what he wanted to see & what issues he usually failed people on.
We then went to the propane supply house, you might have to get everything from a plumbing supply. DH had drawn up a plan so the fellow could see exactly what was needed & explained how to do the fittings so you wouldn't have any problems.

The inspector came, said it was a great job done & passed with flying colours, saved ourselves $800.
It's pretty straightforward if you're somewhat confident in your DIY abilities & diligently check for leaks with a spray bottle of soapy water.