Most of the incandescent bulbs in the clearance/running lights are size 194. You can buy 50 LED replacements for $13 on Amazon:
https://www.amazon.com/T10-8-SMD-Whi...2C204&sr=8-110
They aren't the "best quality" but they also aren't $10 each.... I've been running this type of LED in my running lights for about 10 years now and never had a problem as long as they don't get wet and corrode in the socket from a leaking light lens.
If you use this type, be sure to apply some dielectric grease to the bulb contacts before installing them. That will cut down on corrosion and problems with dim lights. Remember, they are polarity sensitive, so if they don't work when you install them, just pull the LED out, turn it around and reinsert it.