Actually...to make your life even easier...if you haven't altered products_t.tpl, the buy now code is already in there. Just replace this:
Code:
{*** Uncomment it if you need 'Buy Now' button ***
{if $usertype eq "C" and $config.Appearance.buynow_button_enabled eq "Y"}
{include file="customer/main/buy_now.tpl" product=$products[product]}
{/if}
*** Uncomment it if you need 'Buy Now' button ***}
With this:
Code:
{if $usertype eq "C" and $config.Appearance.buynow_button_enabled eq "Y"}
{include file="customer/main/buy_now.tpl" product=$products[product]}
{/if}