We get anxious when we need to leave our stroller unattended, and when a friend's jogging stroller was stolen off of her front porch recently it reminded us to lock things up. One option we found is the Buggyguard combination locks which allow users to lock a stroller to itself, another stroller or a stationary object.
The retractable cable is easy to use and each lock comes with a universal attachment. The Buggyguard is available in monkey, panda, hippo and pig designs. Buggyguard locks are available from most major baby-centric retailers for $24.95. Learn more at Buggyguard.
(Image: Buggyguard)


Shaw's Original Fir...
Those looks like super cheap crappy locks (especially for how much they cost)! If someone is going to steal your pram, they're unlikely to be deterred by such a cheapo lock ... I'd use a bike lock if you think your buggy is at risk!
i just use a bike lock. actually, one of those long cables with loops at both ends & a padlock. i wouldn't use it alone to lock up my bike because it wouldn't deter a real bike thief but it's just fine for the stroller -- and long enough to easily wrap around a pole or bike rack. and it will still be useful when we're done with the stroller.
I got one of these after I heard about strollers stollen form the Bronx Zoo (which we frequent). I ended up with this brand b/c at first I bought a bulky chain and lock from our hardware store and this just seemed like a much easier solution.
I have had this lock for a year now and use it all the time. It is perfect and easy to use! Not cheap at all.
How about using a ski lock instead? They are about 1/2 the price and not so cheesy looking.