Most truck stops sell the standard 3057 and 1157 lights in LED form (in both regular and NA / amber styles) which are found on almost every vehicle ever made, and the round snap in lights you find on most semi-trailers, also in LED form. They're about $20 a bulb the last time I checked, which was several years ago.
Be careful doing this though - LED lights are far more directional than their incandescent counterparts, if you have wrap-around tail-light you need an LED light that has LED's pointing around the edges of the bulb too.
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