I know you can get a cheapie Aldi one at half the price but Omron is the industry leader when it comes blood pressure monitors.
Omron machines are clinically validated for accuracy so you can trust the readings.
The Omron HEM-7130 is their "deluxe model" compared to other basic models which lack any memory, this has a memory for storing 60 readings for one user.
This also features irregular heartbeat detection.
Chemist Warehouse have the same model for $129.99. If you have private health insurance, you might actually be able to claim the full cost of the machine with a pharmacy receipt.
If you have parents with hypertension this makes for a great Chinese New Year present. ;)
Do they still include the ridiculously tiny arm cuffs so that you have to replace them with an expensive large one if you have biceps or flabby arms?