There are several vendors here and many do take Paypal.
So far I have ordered from 3 of them. My first was from QSC from US warehouse stock and came fairly quickly, but the next order from 12/19 hasn´t showed up yet. I keep getting ignored on whatsapp and when I do get an answer it is very short and not helpful. Now I think it is going to come from China but haven´t a clue still as Tracy is very unhelpful. Payment is by bank transfer or crypto. Plus when you get the bottles, they aren´t marked and you have to ask which is which if you order more than one kind of peptide.
I ordered from QST and from TCI on 12/28 and got both orders on 1/2, amazing customer service from both of them, though the edge goes to QST for pricing. TCI is higher price but great service also. Both come in well marked and packaged. It was hard to believe these could get here so fast and payment was easy.
I'm sure there are other great ones here, but I am fairly stocked now for a few months. Just like when you searched for Research Peptides, it can feel overwhelming but really not that difficult and much cheaper to go direct.