Shuttle Art via Amazon has their 15 Colors Dry Erase White Board Markers with Eraser Low-Odor, Chisel Tip Set for $10.99 – 40% off is $6.59 when promotional code BU6K87CA is used at checkout. Shipping is free with prime or on orders over $25.
https://www.amazon.com/dp/B07DC2KLM7