It's let the buyer beware when it comes to using popular online buy and sell sites.
The Saint John police fraud section has had several reports of individuals advertising household items on these sites and when the buyer contacts the "seller" they are told a deposit is required to hold the item.
Callers have done this and when they go to pick up their item they find the address does not exist and they are out their deposit money.
Police are telling users of these sites to follow the rules that are clearly stated at the top of the page on most of these sites.
You should also meet the seller in a public place to conduct your transaction.