where to buy Diatomaceous Earth

pretty sure i have bed bugs, have these bites all over me, especially bad on inner thighs. back itches, bites on my arms, hands, feets, itch til they bleed.

lookin at pics of bed bugs online it looks similar to my bite marks.

Diatomaceous Earth is supposedly a great way to kill em, where do i buy it, i've heard it mentioned on curezone before. i'm itching like CRAZY