Practice some considerations before placing an order online.
1. reputation of the company (Is this a well-established company? Actively registered with the trade industry, etc. No bad news or reviews, positive feedbacks from friends, colleagues who knew or have tried transacting with the company)
2. competitive pricing (Are you getting the best deal? Have you compared their prices with other similar companies?)
3 shipping terms (Do they offer free shipping? What courier they are using and shipping time? If shipping not included in the price, how much additional cost, options for courier and shipping time? This portion sometimes play an important factor in the ultimate price of the product. Also, delivery period is critical especially to those who needs the product right away. )
4. guarantee, warranty or refunds (especially if lost in transit, received with damage or product not functioning as expected, etc.)
5. payment options (more secure if done thru paypal or other similar type, be cautious in giving your bank or credit card info.)
6. other hidden charges (Do not be afraid to ask if there are other fees involving in processing your order.)
Lastly, if your instinct tells you not to proceed inspite of all the considerations. Give it the benefit of the doubt and get second or even third opinion from trusted sources.