The Nerf N-Strike Stampede ECS is awesome I bought my 34 year old (Doctor) brother one for Christmas and he still uses it to shoot his fiance most everyday (so she tells me). I've just bought myself one as defense for when he comes round.
It is fully automatic and comes with 3 large clips, 60 darts and a blast shield.
It does need 6 D batteries but these give it a more realistic weight anyway.
This is £6 less than I bought my brothers for, from amazon, at Christmas.
Use free delivery.