A banner exchange is a free service designed to help you advertise and
promote your website. By inserting a small piece of code we supply,
onto your web page, you will display banner ads from other exchange
members, and in return, your banners will be displayed across the
exchange network. 100% free.
Copi page ( members ) : http://www.showyoursite.com/faq.php#q1
" ShowYourSite.com Your free banner ad exchange. "