Afaik no yeelight product uses zigbee. You can find off-brand zigbee bulbs at 6-12 dollars each depending on shape and size.

Does Yeelight need a hub?

The Yeelight Smart LED Bulb is an affordable color LED bulb that you can control with your phone or with your voice, and it doesn't require a hub. It supports HomeKit, Alexa, and Google platforms and works with other smart devices via IFTTT.

Are Yeelights worth it?

The Yeelight Strip is definitely worth the money. It adds a unique feel to any room, and with the range of features and easy set-up, it is the best smart strip for the price. The possibilities are endless with the Yeelight Strip to turn your room into a modern, well-lit oasis!