i use the raybrig whitesonic, i think i paid about $80/pair
but the prices differ depending on the bulb size...

i have had them for awhile and cant remember where i got them from...

do a quick google search for "raybrig whitesonic" and you should be able to find a few places online...

if i remember where i got mine from i will post the link...

btw, they are stock wattage with a color temp of 5000k

silverstars are 4000k