Coupon code SUN20 for 20% off everything in the store. Sale ends 06/07/2020 >Expired
PETG mixpack deal: https://www.zyltech.com/copy-of-special-offer-8x-ceramic-white-pla-1-kg-1-75mm-filament/ [zyltech.com]
note, the coupon code is good on the mixpack discount, resulting in a cost of $12.37 per 1kg spool!
QA Edit: Seems the coupon is no longer working on the pack since it's a Special Offer item which is excluded from the coupon, but does work on other items on the site.
I use Zyltech all the time, especially their 5kg 'texas size' spools.