Just grabbed these on amazon for $12. Best I could find on amazon.ca. Seem to do the job. Not sure if better options are available on .com.
15 Packs Acrylic Easel Stands... https://www.amazon.ca/dp/B07P8QQM4K?ref=ppx_pop_mob_ap_share
15 Packs Acrylic Easel Stands... https://www.amazon.ca/dp/B07P8QQM4K?ref=ppx_pop_mob_ap_share