How do I know which suppliers to use?

This finding requires some serious research. Get a quote from multiple suppliers and compare their pros and cons. Offer a long term association and business to the reasonable quotation providers; they should offer you competitive prices in return. Select the supplier with the best prices.

NOTE: Before you make the final decision, make sure you've obtained sample products for quality inspection.

Finding a good supplier is all about building a relationship or utilizing a connection with someone who already has the relational foundation. Think like a supplier yourself–would you really give a discount to a seller that you can't trust yet?

Every supplier becomes better with time–you just really have to set the record straight. If you already have a good seller track record, that really helps in expediting the process. Also, once you're done negotiating the terms, just make sure to get a signed contract or any legally binding document–likewise, they also need to build their trustworthiness to you as a seller. Suppliers are generally bigger than sellers–so do everything you can to protect yourself from getting scammed.