YOU SAID:
I bought a substantial amount of products
INTO JAPANESE
かなりの量の製品を購入しました
BACK INTO ENGLISH
Purchased a significant amount of products
INTO JAPANESE
大量の製品を購入した
BACK INTO ENGLISH
bought a lot of products
INTO JAPANESE
たくさんの製品を買った
BACK INTO ENGLISH
bought a lot of products
That didn't even make that much sense in English.