depends where you are, if you have a local scoot shop then buy there to support em you may lose em, if not then any of the major dealers. if using sip you need a minimum order but can't remember how much it is. beware cheap deals on ebay, you get what you pay for usually and ther eis a lot of tat out there, using a main dealer should give some reassurance that the item is of better standard though a lot do source parts from india etc (and some parts from there are ok if truly original) so you still have to be careful but if not up to standard from dealer then send it back and ask for money back.
We don't own this planet, we are only borrowing it from our children. How would you like to give it back to them?