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Comply Foam [complyfoam.com] is having a July 4th Promo: Buy 1 Get 1 FREE expires July 6, 2018. Discount applies automatically at checkout to the product of lower value. One free product per order, Offer excludes Canal Tips and Dispenser Boxes.

Beats by Dre tips [complyfoam.com]
Jaybird X3 tips [complyfoam.com]
Sennheiser [complyfoam.com]

See website for more headphone / earphone foam tips compatible with other brands.