TP-Link Kasa KB100 Dimmable White Smart A19 Light Bulb, 50W Equivalent appears to be on clearance for $11 at some Walmart locations at least around me so YMMV. There was even one listing around me at $9 but out of stock.
No hub required. Works with Alexa.
SKU is 336221625 if you want to use Brickseek.
Brickseek
- No Extra Hardware Required Convenient smart Wi-Fi bulb with no extra hardware required
- Anywhere and Anytime Easy setup and control from anywhere with the free Kasa app
- Save Energy Save energy without sacrificing brightness or quality
- Dimmable Light Dimming flexible white light for customized lighting
- Compatibility Compatible with Android, iOS, Amazon Alexa and the Google Assistant
- Connects to Wi-Fi Secure home Wi-Fi connection is required