SUNLU is offering its 1 kg refill filament line for $10.49, marked down from $18.99. Options include PLA, PLA+, PLA+ 2.0, and PETG depending on availability.
This is spool-free refill filament and requires a compatible SUNLU third-generation reusable spool or Bambu reusable spool. SUNLU advertises free shipping to most U.S. regions. Price, material/color availability, shipping, and promotion terms can change at any time, so verify the final price before checkout.
Retailer link: SUNLU product page