You can make your purchase of the Tempo series straps at https://sgstore.actxa.com/collections/all/products/tempo-2-strap.
Alternatively, you may head to the following locations for the purchase:
1 Rochor Canal Road, #03-01, Sim Lim Square,
Monday to Saturday
10:30am - 6:30pm
(Closed on Sunday)
200 Victoria Street #03-25 Bugis Junction
Monday to Tuesday, Thursday to Sunday
11:00 am - 7:30pm
(Closed on Wednesday)
Do note that stocks are only available on a while stocks last basis.