Cheapest I've seen the Mijia Smart Shoes - previous low was $64.99USD
As per this voucher thread you need to be logged in to use the voucher.
What makes these shoes smart is the AMAZEFIT Intelligent Chip 2 which has the ability to detect movement and store data such as distance covered, speed, calories burned and much more. The chip is IP67 rated and featues a 6-axis sensor to collect data on walking, running and climbing more accurately and synchronises with an app. Besides the smart features, the shoes have features including anti-slip, air cushions, arched soles, antibacterial insoles and soft velvet composite SBR to prevent the shoes slipping off at the ankles and heel.
Don't forget CashRewards!
EDIT: As FiftyCal has noted, the PAYPAL code requires a minimum order amount of $50USD
I'm fairly certain I got these for like $35USD - my regular shoes now, wearing them now, very comfortable. Not water resistant though.
Good shoes though, good find OP.
https://www.ozbargain.com.au/node/335512
Unless these are different shoes of course. My amazfit device never worked.