If your hams pee or poo in the bath sand, use a sieve to sift the waste... usually when they pee in the bath sand, it will be lumped into tiny ball-like... But once the bath sand smells, replace new ones...
I'm using the GEX Deodorant Litter Sand AB-111 ... so far so good... very happy with this product...

the cheapest i know is an online shop...
http://www.petscreations.com/catalog/produ...&products_id=84 Members need to pay SGD5.40... Or source ard Serangoon Nth's pet shops... U're staying in Hougang so should be quite near your place lor... I know one of the shops in Serangoon Nth is selling it at SGD6/plus...

Where do u buy your hams stuff from? SGD7.40 for the bath sand is very expensive... One of the pet shops at Serangoon Nth is selling it at SGD6.00... Of cos the aquarium i mentioned earlier is so far the cheapest... But i dun see them selling the toilet sand...
As for petscreations.com, if u are not in a hurry to buy the toilet sand, maybe u can ask ard any members in HH placing any orders from petscreations... and if the collection place between u two is right, then its a win-win situation... but if its troublesome, u can just go down to Serangoon Nth...
Hope the info helps... :P