I don’t know of them ripping anyone off or anything nefarious. Like the last response from chmuse, you can find positive reviews from people if you read on. No vendor has a perfect track record.
I feel like Nexaph and bfflist are both good options for people who are hesitant. They are a little more expensive than others but they have websites. Nexaph, you can pay with a credit card. My current go to has been SRY-Lisa. They have had stellar deals. All three vendors I mentioned have domestic warehouses.
Do your research though. People on here don’t like to give recommendations for vendors because a lot can go wrong.