front turn signal bulb + cpo questions

[patek_philippe]

yea so, my passenger side turn signal bulb is out. i actually got my left one done a year or so ago at the dealership, wrong move (cost me like $150, complete bs waste of money). anyway, looking back at my invoice statement, the bulb cost $8.75. my question is should i simply purchase this bulb at BMW or is there some site where i can find it for cheaper? (also found the DIY on the main homepage, thank you to whoever posted that up, you are doing us all a great favor!)

also, in regards to my CPO which is ending soon (im at 99,200miles) what should i ask the dealership to do (i also have maintenence warranty).

THANKS IN ADVANCE FRIENDS!