40mm is $18.99 & 50mm is $25.99
https://www.amazon.com/ZhuoChiMall-Crystal-Dispersion-Multi-Color-Education/dp/B08RBQXF8P/ref=mp_s_a_1_1_sspa?dchild=1&keywords=cmy+cube&qid=1624012226&sprefix=cmy&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUFZQVQ5MVNLQkpSNzcmZW5jcnlwdGVkSWQ9QTEwMDY1NTZSRE82VU5aQzRVUlgmZW5jcnlwdGVkQWRJZD1BMDU0NTgwMzJHWUM0TDVaMThWMVYmd2lkZ2V0TmFtZT1zcF9waG9uZV9zZWFyY2hfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==