wah piang.. $7 is way within your initial budget...
in the past, the police used to give them away to neighbourhood
maids.. you can try asking them to give you one 
but seriously.. batteries included..
see if you can bargain with the fellas.. but at $7, i think it's
already dirt cheap
Haha joking.. So confirm is $7? Will the price rise?
Anyway what type of battery they use? Those AAA or small
one?
Do you have one?
