OTC equipment in general is pretty expensive - they are the professional grade tools. I just mentioned their name for comparison sake - not to imply that this is what a weekend warrior should by to work on their car. For a shop - that is a completely different story. Now you have to make sure tools can stand up to the rigors of constant use as well as provide ample protection to the employees, from the liability standpoint.
As for other reasonably priced jack stands - some have mentioned Sear's has some decent 4 corner jacks.
Lots of ways to rotate tires - depends on what equipment you have and how much time you want to spend on it. You don't have to buy any equipment at all, if you want to use what you already have. Without jack stands or floor jack, you can rotate your tires using the factory scissor jack and the compact spare tire. Lift up one corner of the car, remove wheel, replace with compact spare, lower that corner - go to the corner you want to swap the tire with, jack it up - swap wheels, lower corner. Go back to the corner with the compact spare - swap it with the wheel. Repeat for the other corners.
Of course, that method will take a lot of time - for impatient people like me - I'll use the floor jack and lift up one side of the car, swap that side, drop the car - repeat on the other side. Need a fairly beefy floor jack to do this and some experience. Need to find the balance point on the car, otherwise you will not be able to lift up the car smoothly, likelihood that something bad will happen.
I don't know of many people that try and lift the entire car off the ground to rotate the tires - I wouldn't recommend that unless you got some seriously strong jack stands. The biggest issue is lifting the car onto the jack stands. Ideally, you want to do it all at one shot, think garage lift - but at that point, why bother with the jack stands. Picking it up at each corner or as an axle pair can cause excessive side loading which can collapse or topple a floor jack. That's there is a big warning label on them to only be used in matching pairs, never to support both ends of the vehicle simultaneously.
I personally never fully rest the weight of the car on the jack stands, as I use them exclusively as a backup to my floor jack. I trust the hydraulics on my floor-jack more than I trust my cheap jack stands - this being that I know what the floor jack can do, don't have any idea how much side loading my jack stands can tolerate. I know this is counter to the prevailing attitude with most mechanics - most trust the jack stands, not the floor jack. I totally agree with this - but if you saw my floor jack, you'd understand.
If it was the other way around - like if I used a cheap trolley jack - then yes, I'd invest in some heavier duty jack stands and use them to take the full weight of the car, use the hydraulic as a secondary. At the shop, everything has to be mechanically locked for safely - can't rely on any hydraulics, everything is backed by some sort of mechanical bridge or jack stand.