The answer will depend on your definition of "affordable". The availability in local market is very limited as of now, mainly from TP-Link.
Firstly, if you subscribe to Singtel 10Gbps, then TP-Link HB810 (BE22000 rated) is free as part of the subscription. They also offer the seond unit at a discount price of S$16.80 per month (S$403.2 in total).
https://forums.hardwarezone.com.sg/threads/singtel-10gbps-enhanced-wifi-7.6983542/
I believe HB810 is now only exclusive to Singtel but I can see people started to list the unit in Carousell and asking for about S$600. The price should go down soon to something around S$500 if more people subscribe to Singtel 10Gbps plan.
Take note it is using EasyMesh and not compatible with existing TP-Link Deco.
Note:
As of now in Jan 2024, I do not recommend buying any local version of WiFi 7 routers due to high price.
For local version of WiFI 7 routers in the open market, cheapest single WiFi 7 router is probably TP-Link Archer BE550 (BE9300 rated) at around S$499. Dual pack is TP-Link Deco BE65 (BE11000 rated) at around S$899.
Reference price from Challenger:
https://www.challenger.sg/tp-link-wifi7
Deco BE85 (BE22000) --> dual pack at S$1199
Deco BE65 (BE11000) --> dual pack at S$899, triple pack at S$1399
Archer BE800 (BE19000) --> S$799