Inac ak by niekto chcel riesit trvale preparaty, tak VWR ponuka za cca 20 eur rozne sady
napr:
https://sk.vwr.com/store/product/4588651/cryptogames-prepared-slides
https://sk.vwr.com/store/product/16928745/prepared-microscope-slides-typical-monocot-roots
(search: prepared slides)

Pripadne skusit nejakeho lokalneho dodavatela skolskych potrieb:
https://www.dalekohlady.eu/c/mikroskopy-lupy/prislusenstvo-pre-mikroskopy/hotove-preparaty

Minimalne su dobre tieto veci, ked chces overit ci vsetko funguje, nastavit focus, alebo zistit ci nemas mazanec na objektive/okulari/cipe :)

A ak by si chcel robit senny nalev s crievickami a inymi potvorami, mam k tomu nejake zdroje ;)