Search eBay for the following words: WARM WHITE LED SMD (INSERT THE TERMINOLOGY OF YOUR SOCKET TYPE). All of my interior halogen bulbs were G4 pin-type bulbs. I now have brighter lights at less than 1/5th the amp draw. In my case some of the bulbs are rear-pin and some are side-pin, so if you're using G4 you might need to add those terms to your search. My bulbs were all under $10 each, and I found bulk listings out of Hong Kong that ended up being less than $5/bulb.

Do this search and you'll see samples of the types of bulb I'm using: WARM WHITE LED SMD g4

PS - out of 30 bulbs I had 2 with intermittent defects that didn't show up until the bulb warmed up (would turn off then come back on after it cooled). Not worth sending back, but if ordering a lot of one type you should get one or two extra.