This months Grow It! magazine (as in June, not the one currently on sale) had an offer for saffron bulbs.
IIRC you got 30 bulbs for free, just a fiver for delivery.
They were the purple ones though.
I fancy giving them a go just because 'it is more expensive than gold'.
Plus I'd like to take some into the canteen at work and explain to them that 'saffron rice' is rice that has been coloured with saffron, and not just what you call normal rice when you serve it with a curry.