Avoiding nested if statements
One suggestion is to make the roles two classes, initialize them based on the role and call the save function.

 class UserRole
    def save(product)
     redirect_to new_product_offer_path(product) 
    end
 end
 class AdminRole &lt; UserRole
    def save(product)
     redirect_to krowd_path(product) 
    end
 end
 def create_role(r)
    case r
    when :admin
        return AdminRole.new()
    else
        return UserRole.new()
    end
 end


 ....
 role = create_role(current_member.role)

 if @product.save 
   role.save(@product) 
 else 
   render :new 
 end