This is the best price I could find for the LED replacements for the Aqua Signal nav lights on our 1999 Cdory 22. I ordered the warm white from ledlightbulbs.net. The total for 2 bulbs with shipping was comparable to 1 bulb from marine beam.
2.6W Festoon 44mm the dimple boats Navigation led bulbs, 10~40V
$6.50
Festoon led bulbs with the dimple, Navigation Festoon LED Replacement Bulb, 44mm, Cool White/Warm White, 8-40VDC (2.6W), Omni-Directional, Dimpled Barrel End Contacts. This high output LED cluster festoon style bulb easily exceeds the brightness level of the 10W incandescent bulb it replaces. It has panels on five different planes, each containing 6 SMD LEDs for a total of 30 LEDs delivering crisp white light beyond 3 nautical miles. The dimpled barrel end contacts are made to fit the popular Aqua Signal Series 25 navigation lights. It replaces the 12V festoon bulb #ASL-902007 or the 24V #ASL-902017. The warm white version is best suited for red, green, or bi-color combo fixtures as it will render the red or green color more accurately. Although these may also be used for mast-head & stern lights, our cool white version is an even better choice for these applications.