Hi Darla!
Official Merchandise of big sports competitions, specially one driven by advertising money and backed by big companies maintain tight control of distribution – that, is they only have one distribution channel, and that is themselves! Sure, there will be wholesalers out there claiming they sell a certain official merchandise for cheap, but you will soon find out they are all fakes. The best you can do is to contact the marketing department of Formula 1 and ask if they allow wholesale purchase for retail purposes.
Do not take chances going direct to the manufacturer or looking for dropshippers, any company as big as F1 guard their copyrights with a battalion of lawyers ready to do battle in court.