Housing is available... cost of a whole setup is another thing all together... http://www.ikelite.com/housings/canon/6871.50-canon-500d.html
Btw.... Getting 2nd hand housing isn't as easy for DSLR...
Bro i really wan to get a 2nd hand set. coz new set is really out my current budget. Doe noe will take how long in order to save to buy a new set. thanks bro.
What Diverholc is trying to say is that cost of brining DSLR down is more than just housing. Ports and other accessory cost will be significant.