Jimi Hendrix wannabees might need to look away now - this is not meant for the serious musician so keep going!
Otherwise, Home bargains have 36" Junior classical guitars in either natural wood or pink finish at £16.99 - a great price as the cheapest I found was around £29.99 - although this looks identical to me to the ones that are selling at £35.00 from John Lewis'. They also had guitar stands at £5.99 each too.
Not sure if it's a local or national deal but it doesn't appear to be available online.
A great christmas pressie for the littlies to have fun with and who knows, if they're interested, it might be worth going onto something bigger and better!