Amazon.com: Wacom CDS600P Bamboo Spark with Tablet Sleeve : Electronics
Ballpoint 1.0 Refills (3-pack) ACK22207
Wacom Bamboo spark Pen – Multimedia Kingdom
5 x Refill 67 mm Premium Ministar Refill for Wacom Bamboo Slate, Folio, Spark, Ballpoint Pen, Premium Refill with Soft Writing Feel, Swiss Made - Red : Amazon.de: Stationery & Office Supplies
Quality of Wacom Bamboo Slate digitizer pen is abysmal; endcaps snap-off : r/wacom