Is it wise to buy memory cards from ebay or should this be avoided as i have seen some Kingston memory 1gb chips for £20 and do not no what to do as these are £70 in the shops

Have they got good feedback?

i've never had a bad experience buying memory cards on ebay, like Space says check out the seller's feedback

Check feedback for any mention of fake cards.

I'd buy from somewhere like play.com or 7dayshop.com.

You don't mention what type of memory card you need though.

Its quite simple use the simple rules

1, check feedback
2, Dont spend more than you could afford to write off
3, Try to buy from uk supplier
4, make sure postage reflects the item
5, Tell seller bad feedback will be left for poor quality.
6, Always check the last minute sales link on their home page many bargains to be had there.