Install the following contributions in my customized oscommerce shop:
Header Tags Controller ([login to view URL],207)
Ultimate SEO URLs ([login to view URL],2823)
MS2 HTML WYSIWYG Editor, Product Desc, Email + ([login to view URL],1347)
'On the Fly' Auto Thumbnailer using GD Library ([login to view URL],2226)
Credit Class & Gift Voucher ([login to view URL],282)
and make sure they all work good without errors in my shop...
Budget: $5-$20