Protect yourself

Avoid scams, deal locally.  Beware wiring (e.g. Western Union), cashier checks, money orders, store debit cards, etc.  If someone asks you to use Paypal, Venmo, or other online money transfer process, make sure you protect yourself in case the product(s) do not show up.  For example, do not use the Paypal Friends and Family transfer option because you cannot get a refund if the product does not show up.  Refer to this link for more information about online security and protecting yourself against purchase scams.  Likewise if you are going to meet someone for an in-person transaction, refer to this link for advice.