https://www.amazon.com/Potato-Dextrose-Agar-Plates-Prepoured/dp/B07JN7GFWW?pd_rd_w=wSbEG&pf_rd_p=85da05e5-c593-4314-b5c1-e397081af052&pf_rd_r=VJNJYZ3NANSDVFY3RZEV&pd_rd_r=566857a6-9225-4fbe-b96f-34c2ba400a47&pd_rd_wg=bwuLM&pd_rd_i=B07JN7GFWW&psc=1&ref_=pd_bap_m_rp_12_sc I got these once and they came in perfect condition but there pretty pricey, if you have the opportunity to use another site I'd recommend this one https://myctyson.com/shop/mushroom-growing-supplies/pre-poured-agar-dishes-slants/ . I'm sure you could find cheaper options on amazon and else where but both have arrived without cracks or contam even without parafilm pre applied.