When transacting with an online market place, especially when you will be making your payment, always make sure that the payment site they land you is protected. This may be accomplished through looking at the address bar. When it shows "https" then it is safe. If it is only "http" then it is not. Goods on auction websites may have the same items that are for sale on other websites. You could try to take a look first so that you do not need to go through the trouble of bidding.
You must remember that not every product’s cost goes down so easily, so look around for the best bargains and buy only what you need at present, otherwise you won’t ever buy anything! The best means of making payment online will be through your credit card or through PayPal. Turn down every vendor who wants to be paid in cash money because you don't have any protection with this particular means of payment.