A list of potential substitutes, if you can
Knitting with Recycled (and Upcycled) Yarns – TONIA KNITS
There's New Recycled Yarns! ‣ The Crafty Therapist
Paintbox's planet friendly recycled yarns have arrived!
25 A+ Knit Gift Ideas for Teachers
Best Bulky & Super Bulky Yarn for Summer Projects! – PINK SHEEP DESIGN
Paintbox Yarns Recycled Cotton Worsted Yarn at WEBS
Paintbox Simply DK – It's Crochet O'Clock
Paintbox Yarns Recycled Cotton Worsted (100g) – Paintbox Yarns
Yarn Review - Paintbox Recycled Cotton Worsted