Price difference on App and website

Just wondering why the keypad is $33.99 on app but $29.99 on website and why motion sensors are $25.49 and out of stock on app but $29.99 on website. Has anyone else noticed price discrepancies? I’ve reached out to eufy and nobody can give me an explanation. I have a 15% off code that is app only and unable to purchase everything needed to complete my system due to these errors.