quite a few options here (2pks PLA PRO for $9.90+/kg, PLA for $12.64, and some silk colors for $12.09):

2-pk PLA PRO for ~$20 (depends on coupon)

• 40% off black/gray or white/gray
• 35% off black/white or gray/gray
• 30% off black/black or white/white

Silk PLA for $12.09+/kg

• 45% off silk sky blue, silk teal, silk yellow/gold
• 30% off silk bronze, intense green, ocean blue, purple, yellow-green

1-pk PLA PRO for $12.64+/kg

• 45% off gray, black, green, white, yellow
• 30% off glow in the dark blue or green, blue grey, olive green, orange, purple, wine red, blue, dark brown, red, silver, sky blue