A better alternative is to pre-fill the form with a "standard" discount, or have that code somewhere nearby. Coupon codes work wonders for tracking off site promotions. Are people finding you from a blog, a magazine article, a special event, or what? Having specific coupon codes for each let's you measure the effectiveness of campaigns you otherwise wouldn't be able to accurately measure.
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A better alternative is to pre-fill the form with a "standard" discount, or have that code somewhere nearby. Coupon codes work wonders for tracking off site promotions. Are people finding you from a blog, a magazine article, a special event, or what? Having specific coupon codes for each let's you measure the effectiveness of campaigns you otherwise wouldn't be able to accurately measure.