I've seen one Italian make of angled pickups, and they were about €310 for a set (roughly £280/AUD$510/US$360), but you'd need to know what angle the kit pickups were, as there seems to be several, which will limit choice still further. DiMarzio and Seymour Duncan make a lot of 7- and 8-string pickups, but they are all standard pattern units. OK, they aren't the cheapest pickups available, but they'd certainly be about 2/3 of that. Very few budget brands do straight 7-string pickups, let alone angled ones. Artec, kent Armstrong and Warman do a few standard 7s, but not GFS, Tonerider or IronGear.

If the guitar kit is otherwise good, then it seems a shame not to be able to fit decent but affordable pickups into it, as I doubt the kit pickups are anything but passable.