have you thought about building it yourself? If I can do it anyone can. When I started I hadn't done any woodwork since I left school in 1970.
It's the cheapest way even if you make some mistakes but you will learn from them. I had thought that routing the curves would be the hardest but I had trouble routing in a straight line , even with a straight strip to guide me. I was using MDF the depth of the slot laid on a baseboard so I got the timber yard to cut me dome strips in the right width.
You can see some old pictures of my humble effort on:
www.slotcenter.net/roche.htm (I really ought to send David some more recent photos)
You might also check with Spanish distributor Cric-Crac, who handle something called the Vario-System, which are sections of pre-routed track, 4, 6 or 8 lane. Haven't looked at this recently, but assume they are still available.
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