I can refer you to be a SIA Sports Club member. You do not have to pay the hefty sum of money here to be a member like most clubs but merely a monthly subscription fee. Above table shows eg $1,800 for one year, $2,700 for 3 years or $3,900 for 5 years. If you opt for the 5 year subscription then it works out to $65 a month and that's all you've to pay. For more info click here
Above contributed by ex-Flight Attendant of Singapore Airlines.