The countdown to Christmas has begun, and those looking to get a start on their shopping need look no further than their computer screens.

From electronics to clothing and fragrances, money can be saved and bargains found online, thanks to the strength of the New Zealand dollar.

But while buying online can save you money, it's easy to get caught out by dodgy retailers, non-secure websites and postage costs of more than $100.

An 8GB iPod Touch costs upwards of $328 at electronic stores here, but buying online at the American Apple store will cost you US$199 ($266) - with free shipping - saving you more than $62.

A pair of men's adidas original Superstar 2 shoes costs up to US$37.38 ($49.72) from amazon.com although shipping is extra - and $20.27 more at Foot Locker, where it sells for $69.99.

American shopping site eBay.com sells the same shoes for as little as US$39.95.

Although you run the risk of buying fake labels online, shipping costs are often free and postage on eBay isn't usually more than $30.

Standard Ray-Ban Wayfarer sunglasses sell for between $264.90 and $305 at local branches of the Sunglass Hut, but cost between $101.32 and $145.35 from amazon.com.

Research from the Retail Consulting Group estimates the online shopping industry to bring in around $1 billion a year, particularly with shoppers buying stationery, books and appliances online.

A Consumer New Zealand report last year warned shoppers to be wary when buying online because the retailers weren't covered by the Consumer Guarantees Act.

The report urged Kiwis to do their research in local shops because they may be able to find a better deal than they could get online.

"Online shopping isn't always cheaper - it depends on what you buy and whether your purchase attracts GST or Customs duty [fees]," the report states. "Check the total costs carefully to make sure they include delivery, taxes, and any other costs - these should be disclosed before you start ordering."

Credit card fraud is another concern and New Zealand Marketing Association chief executive Sue McCarty said shoppers should never cut corners when it came to the safety of their money.

"There are plenty of very sophisticated ways scammers can get hold of your details so if you give them out, make sure it is only to credible sources."

She said shoppers using a credit card online should make sure the site is secure.

"Always look for a lock on a website to make sure it's secure. It's also a good idea to have a look to see if the site has a security statement."