You're going to send an email to your friend telling them about:

Egarage.com.au - Garage sales and Classifieds (http://www.egarage.com.au)

Your email will read as the following:
Hi <Your friend's name>,
I found a good online shop that you maybe interest in.
Website : Egarage.com.au - Garage sales and Classifieds
http://www.egarage.com.au
I found this website at http://www.shophere.biz
Sincerely,
<Your name>
<Your email address>