It's currently £5 inc. delivery on Amazon.co.uk. This puts it into Raspberry Pi Zero and NodeMCU/ESP8266 territory.

Add to the fact that internally it's not very different to the venerable TP-Link WR-703N and it's possibly a great OpenWRT device to tinker with.

I've used Gearbest in the past. They're ok to order from generally, but their unsubscribe mailing list email link doesn't work and I had trouble ordering from them initially due to delivery address issues at my end.