When they ask for your bank routing number JUST SAY NO.
When they ask for your credit card info JUST SAY NO.
When they ask you to cash a check for them JUST SAY NO.
When they ask you to meet them at the corner of Main and Broadway to pick up your merchandise. Be sure to take someone with you. When a dodgy guy shows up and you ask him why he is an hour late and he says "Well I saw you but I didn't think it was you. You were supposed to be alone but you brought your girlfriend and that threw me off. Gimme the $200.00 and I will go get your merchandise. Its 2 blocks away at Angelo's house." JUST SAY NO.
I actually had that happen to me! An idiot actually thought I would fall for that. O M G