Wholesale rewards patience. These are the mistakes we see most often from people just starting.
Buying big on the first order
Confidence is not data. Start with a quantity you can afford to be wrong about.
Ignoring restrictions
Check what you are allowed to sell before you pay, not when the boxes arrive.
Pricing from the buy box alone
A current price is not a guaranteed price. Look at how it has moved.
Forgetting small costs
Prep, labels, inbound shipping and returns all take a bite. Add them to the calculation.
Choosing a supplier by price only
A cheap price without paperwork or a contact who answers is expensive in the end.