http://www.ebay.com.au/itm/VOLVO-240-Series-1981-to-1993-PREMIUM-REAR-ONE-WHEEL-BEARING-KIT-2921-/251442663773?hash=item3a8b26915d:m:mpp72uYnZntvNWDXOdWtdhA
Not a particularly cheap kit by the looks of it. FCP or IPD will be cheaper, the cost of postage may not make it any cheaper overall though.
It's very rare for them to wear out on Volvo's, maybe you'd be better off throwing a pair of used axles and bearing races in it, with a pair of new inner seals.