I guess those cilantro pills might be a specially prepared concentrate, like for example the way olive leaf extract is prepared.

I found this though, for under $5. I guess it might just be cilantro stuffed into capsules and not concentrated.

http://www.swansonvitamins.com/SW1112/ItemDetail?SourceCode=INTL405&CAWELAID=129500016

Herb Pharm makes liquid cilantro concentrate for around $9 an ounce.