I got a complete alloy and tyre for £120 from a wrecker in Newark. Can't remember the name at present but he lists what models he has on eBay.
Try these:
https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2055359.m570.l1313.TR0.TRC0.H0.Xoutlander+phev+breaking.TRS0&_nkw=outlander+phev+breaking&_sacat=0