horrible.rb

  def list_old
    @brand = params[:brand]
    @group = params[:group]
    @title = "#{@brand.capitalize} #{@group.capitalize}"

    case @brand
      when 'usedsteinway':
        @title = "Pre-Owned & Refurbished Steinway #{@group.capitalize}"
        @products = Product.stats.brand('steinway').group(@group).used.price
      when 'cristofori':
        @products = Product.stats.group(@group).brand('CR').not_used.price
      when 'roland':
        case @group
          when 'grands':
            @products = Product.stats.brand(@brand).digital_grand.not_used.price
          else
            @products = Product.stats.brand(@brand).digitals.not_used.not_digital_grand.price
        end
      else
        case @group
          when 'digitals':
            @products = Product.stats.brand(@brand).digitals.not_used.price
          when 'players':
            @products = Product.stats.brand(@brand).not_used.dap.price
          else
            @products = Product.stats.group(@group).brand(@brand).not_used.not_dap.price
        end
    end
   end

muchbetter.rb

  def list
    render :template => 'product/list'
  end

  def select_by_group
    case params[:group]
    when 'digitals': 
      @products = Product.stats.brand(params[:action]).digitals.not_used.price
      list
    when 'players':
      @products = Product.stats.brand(params[:action]).not_used.dap.price
      list
    end
  end

  def default_select
    @products = Product.stats.brand(params[:action]).group(params[:group]).not_used.not_dap.price
    list
  end

  def yamaha
    select_by_group || default_select
  end

  def steinway
    self.yamaha
  end

  def usedsteinway
    @title = "Pre-Owned & Refurbished Steinway"
    select_by_group || @products = Product.stats.brand('steinway').group(params[:group]).used.price
    list
  end

  def cristofori
    @title = 'Cristofori'
    params[:action] = 'CR'
    self.yamaha
  end

  def roland
    if params[:group] == 'grands'
       @products = Product.stats.brand(params[:action]).digital_grand.not_used.price
    else
       @products = Product.stats.brand(params[:action]).digitals.not_used.not_digital_grand.price
    end

    list
  end