Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Why are the refills more expensive than the pens?

Zebra's F-301 Stainless Steel Retractable Ballpoint Pen 0.7mm Black Dozen (27110AMZ)for $20.18 (and free shipping with Amazon Prime).Zebra's F-402 Stainless Steel Retractable Ballpoint Pen 0.7mm Black Dozen (29210AMZ)for $38.92 (and free shipping with Amazon Prime).The refills, however, typically are priced around $6-$7 for product & shipping, for a 2-pack.That's $36 for one dozen refills, barely better than the cost of the F-402 pens, and nearly twice the cost of the F-301 pens.Now, the environmentalist in me wishes to reuse these pens, as their construction is solid, and they should last several refills. However, at these prices, it makes no sense!If I could get a dozen refills for $12 (including shipping), I'd buy them.