Wien bridge oscillator amplitude stability methods
Any low-voltage, low-power incandescent bulb can be made to work.  The trouble, in 2019, is finding them -- LED's just work so spectacularly better for making light from battery power, you'll need to dig around to find incandescent bulbs.

If you can find them, get some low-voltage (1.5 or 3V) "grain of wheat" bulbs.

If I were going to make a Wein bridge oscillator for production, I think I'd find an alternative to using a light bulb to set the gain.  I'd probably use a separate amplitude-measuring stage followed by an electronically-variable resistor.  For that I'd start with an analog multiplier, or perhaps a JFET or a switched-capacitor "resistor" operating well above my highest intended frequency.  I might use a CdS photocell with an LED shining on it.