Opel/Vauxhall Astra Van

I currently own an Opel/Vauxhall Astra van, 1.7 DTI, 90,000 miles, year 2000

I just replaced the left hand side wheel bearing on the passenger side.
NOW the drivers side has gone too. Where can I buy a new wheel bearing for my van?? I can not afford to buy it from the garage.

Thanks, much help need x