Unfortunately , those (and AirSoft sadly )are totally illegal here. I got busted with one at high school back in 1994 (had it in my bag on the weekend, some deadbeat dipsh*t was rifling through my back and ratted on me, bastard!) and I had to have a little chat with the Po-lice.
Marvin, I love my Nerf stuff. Future wife on the other hand, not a fan unless she needs something to shoot at me. I'm usually finding cool gear at places like Toys R Us, although most places are scaling their wares back a bit and selling that cheap knock off Air Blaster shyte (K-Mart and Target aren't great. Don't even bother with Myer). There aren't too many independent toy stores keeping this stuff, though you might want to try Toy World although they're usually over priced with everything they sell now. It's a shame because they used to be a great store! They only bonus with them is that I've rarely seen a Toy World here that updates it's stock regularly. But I think your best bet is the interwebz.
Speaking of interwebz, if you're only getting a paltry 5-6 ft in your shots, look at the modding tutes on youtube. I think, on average, I'm getting about 8-9 metres with my gear although the longshot bleeds a lot of energy, even after modding and I only get around 5 with that. Once you remove the air flow restrictor you'll get a significant increase in range on your pump/bolt action weapons. If you add a new spring to it, you'll get even more! The battery powered ones are more difficult to mod, but it can be done. For example:
And the how to guide