Even if there were some sort of bulk discount, my advice is always that if you’ve got someone who’s technically handy and has the time to build controls, panels, &c you’ll get a far better simulator for your money than you will by buying off the shelf.
Take instrument panels for example… There are numerous ways to go. At the top end you’ve got the option of building servo/stepper motor controlled instruments and gauges.
At the other end one of the cheapest, and still very effective, methods is to build a panel with cut outs that sits over an LCD monitor.
Off the shelf you can buy exactly that:
but it’ll cost you £1,195 for the privilege.
Here is one man’s very nice home made example of a Bell 206 panel using just that technique.
Cost involved? One LCD monitor (I just bought myself another 19" widescreen for £10), some masonite board, some screws, and a couple of switches.
You can make your sim as complex or as simple as you wish, and customise it to your specifications rather than being stuck with generic options.
A google search will show you the variety of home build solutions, from the cheap and basic to the more advanced.
I’ve always been inspired by this Bell 206 sim.
Granted, much of this is toward the higher end (he machines a lot of his own parts from aluminium, and obviously he’s installed it into an actual 206 airframe) but it really does show the kind of thing you can create with a little ingenuity.
If you love a project then a home build might be the way to go.
Personally, for the same money, I’d always choose to go for something custom and far superior to a basic, over-priced joystick, pedals, and panels set up.
Not least because most of the joysticks on the market today look stupid.