We spoke to some of the local suppliers, and for a basic murphy bed and cabinet with no additional storage space the price would have been about $3,500. That's a little steep, but the bigger problem is that we didn't like the style of any of them.
I'd seen two ikea hacks that used Pax cabinets with a murphy bed kit:
Neither of those were what we were looking for either, but they inspired me to try something similar with some tweaks.
Step 1: Two Pax Wardrobes
If I were doing it again, I would probably increase the spacing to 180cm, just to get a few more inches clearance.
Step 2: Assemble and Install the Bed Mechanism
Here it's shown assembled and installed. It rests on the floor, and is attached to the wall at the baseboard level with 8 screws.
Just for reference, the mattress is a 12" pillowtop, with a mattresspad on top of that. It's currently set up so that it's tight to the wall, but there's enough clearance that I move the bed further out from the wall to hang a picture on there.
Overall I'm really impressed with the quality of the Next Bed kit, and would recommend it to anyone. The instructions are clear, and they have several helpful assembly videos available online as well.