Amazon had the official PS red/blue 2-packs for $6.95 last year just after BF. Maybe they'll have a repeat if you don't want to take a chance with "generic." My experience with a 3rd party card is it generally works, but slower, and occasionally fails to access.
BTW my one experience with Hong Kong Air Mail was through Play-Asia and it took 9 days, but arrived intact. Wouldn't worry too much about that part. Hong Kong has their congee together.