Knife Country USA via Amazon offers the Kershaw Thistle Folding Knife for $13.58 with free shipping. That's the lowest price we could find by $4. It features a 3.25" blade, liner lock, and a pocket clip.
Walmart offers the Kershaw Leek Folding Knife with Speed Safe Assist in Black for $30.98. (Amazon charges the same with free shipping.) Choose in-store pickup to avoid the $5.99 shipping fee. That's the lowest price we could find by $22. It features a reversible pocket clip and 3" blade.