If you order two of these little trees, usually priced at £29.99 then it takes off an extra £10. You could buy two for £20 plus p&p (£4.95).
They also have the mini fruit collection for £29.95 http://www.thompson-morgan.com/vip/mini-fruit-tree-collection/tcb56849pbTM
I'm not a gardener but these seemed a good offer to me so I thought I'd share. If your order is more than £60 then you get free delivery :)
If this is a crap offer, please be gentle. Let me savour this moment...