Don't know if you've seen this before but Fiats new website has an updated accessories page with prices. There's a pretty good Doblo section. Check the links at the bottom of the page.

detachable towbar - £400
& they only do the ali roof bars - would much prefer the rails.

Like the ski carrier that straps to the back. Anyone know if you can get something similar to carry cycles? (rather than having them mounted horizontally)