Replacement cover for a 6310, any recommendations ?

Hi All,
I've done a web search for this, and prices seem to range from
7.99 to 35.00 !!! (while I appreciate that you get what you pay for, 35
quid seem a bit high, its for may wife and I can't afford to get
anything that looks to 'cheap and nasty', or I'll never hear the end of
it...)
Can anyone recommend either a range or online supplier ?
Looking for either blue or the original black/gold style.
--
Steve