Try the big brockenhauses - second hand. Transport will be a serious undertaking, but the 'up' side is that you could get a fabulous vintage item for a fraction of the cost of new...
I would recommend asking at the 'Zurcher brockenhaus' (they have lots of furniture in their back room which isn't on display)...and the other one to try is the massive furniture warehouse for 'brocki-land' at Dietikon.
I have seen the most beautiful four poster and sleigh beds, vintage, solid wood...at the brockenhauses....you may get lucky...
www.tigel.ch is in Seefeld, and with them I would also recommend speaking to them - they don't store a lot of large items, but they might be prepared to call you if they source something that might fit their needs - they have a woodworking shop as well and make beautiful (and extremely pricey) one-off wooden furniture...and they repair and refurbish old stuff that comes in as donations...they are a charity too...