I have just gone in to thr Roberts roastery website e-coffee.co.uk which was shut for ages, but has been revamped (not sure when, haven't looked for a while).
I notice they are selling green beans now, not a huge range, but good prices: £4.50 for 500g of Brazilian Cachoera incl postage, which is actually even cheaper all-in than our resident favourite, who will no doubt beat me senseless for passing this info on
Worth a look, and they do some excellent (roasted) espresso blends.