You save a lot by buying it from Chemist Warehouse (Australia).

Regaine Men's Extra Strength Minoxidil Foam Hair Regrowth Treatment 4 x 60g for AUD 90.99.

Delivery fee is AUD 25.12 (approximately HKD 132) for one pack.

Total is around HKD 600 including delivery compared to HKD 900 in Hong Kong.

Non foam version on sale as well but i prefer the foam version.

Womens foam version is on sale as well.