TO THE OP, I have found the Two Bros turn bulbs to blow fairly frequently. I have three I would be glad to send your way. However, as already mentioned, as you'll be blowing bulbs at least once a month, you might as well pony up and go LED. Just remember to buy the rely to slow down the blinking.
Anyway, if you want the bulbs, shoot me your address. Also, make sure you can remove the bulb first as I've had alot of them fall apart in my neddlenose pliers.