Amazon has 15-Pack Pilot FriXion Clicker Erasable Gel Pens (Fine Point 0.7 mm, Assorted Colors) on sale for $17.67. Shipping is free w/ Prime or on $35+ orders.

Product Info:

• Write, erase and rewrite repeatedly without damaging your documents; Unique vibrant and smooth-flowing thermo-sensitive ink disappears completely with erasing friction
• An innovative mechanism allows you to retract the pen tip with a single click; The soft rubberized grip delivers a comfortable writing experience
• Save money & reduce waste by refilling your pen with Pilot FriXion refills (sold separately); Quick drying ink helps prevent smudges and smears; 15-pack pouch features black, blue, red, turquoise, purple, navy, pink, & green pens