Maybe see if there's something that interests you that's exclusive to ABC stores? If the ABC store has something and JB Hi-Fi have it, I'll get it from JB because it's cheaper, but perhaps ABC will have something exclusive to them, ABC dvds or merchandise that you want?

If the voucher's for you, spend it on you I reckon. If I give a friend a voucher I don't think 'here, spend this on other people'.