Those of you transiting SIN, ex-Australia, on SQ may be interested in this:
I recall redeeming something similar 5 or so years ago, but have a feeling it was more than $10 each way.
www.changiairport.com
Receive up to S$20 worth of Changi Rewards e-Voucher when you travel with Singapore Airlines (SQ) from Australia, transiting via Singapore to anywhere in the world!*
e-Voucher(s) must be collected at least 3 days before departure from Australia, while stocks last.
*e-Voucher(s) can be used at all participating retail outlets in Changi Airport – no minimum spend required.
Terms and Conditions apply.
If eligible, you can use both 2x $10 in the one transaction:
1.5 CR e-Vouchers can only be used in denominations of S$10. For each transaction, only one CR account may be used. If one CR account has more than one CR e-Voucher,
all the CR e-Vouchers in that CR account may be used in a single transaction.