We cannot vouch or recommend anyone specific. Yesterday they were respectable sellers and trusted stores, and today or tomorrow they can start to cheat. This is such a business. Don't ever let yourself be fooled. Don't be tempted by offers and conditions. Everyone is sensitive to any transaction and approach it deliberately, carefully and after analyzing all the possible risks of the purchase.
To protect yourself at least to a small extent, follow these steps:
1. Contact the selected seller and ask him through which escrow service he agrees to work.
2. Study reviews of this service from other users. Be careful and attentive, reviews can be twisted and fake. Examine the number and quality of messages that were left by users who made specific recommendations.
3. Ask for 2-3 reliable guarantors from respected users from private forums.
4. Offer payment through a payment system, for example PayPal, with the ability to challenge the transaction and return the money in case of providing invalid material or any claims.
5. Ask for a link to reviews from satisfied customers on various other forums.