When you go to buy anything online you have to make sure you choose a reputable site and one that has a return policy, just in case the goods you buy are not right. You will need to look for signs that your chosen online store is safe and secure with the payment pages encrypting your payment details. Look for the URL starting https; the s on the end means it is secure. Another way to tell is the padlock symbol on the bottom right of the page. And don't forget to read all the terms and conditions first.
Those that want to consider the environmental impact can go "green" with a miniature hand-operated version. They are inexpensive and use very little soap and water, and no electricity. If you want the absolute king of the hill when it comes to engineering and performance, treat yourself a Miele washing machine.