Amazon has Sengled Smart LED Multicolor (Element Color Plus) Bulb on sale for $22.49.
I think any colored bulb under $25 is a good deal. I’ve had good experiences with Sengled white bulbs, though I wish they could do the fade in/out effect like Philip Hue bulbs can do.
This deal makes me slightly regret purchasing those two TP-Link WiFi bulbs for $45…