Hi Ivan,
Most phone accessories' suppliers only accept wholesale orders. One reason for this is to maximize your earning potential. If you purchase a single unit of a screen protector to be shipped to your customer, chances are your profit margin won't be that good.
Nonetheless here are some drop shippers that you might want to work with:
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^ They have a US based headquarters so they can ship your products sooner
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Be advised that the prices listed on their website are mostly in retail. Sign up as a reseller for these suppliers so you can view their dropshipping prices.
Hope this helps!