Are there any online retailers that sell OCS (officer candidate
school) rank patches for the new Army ACU uniform?  If so, who sells
them?

OCS rank parallels normal Army officer rankings but uses dots ("pips")
and diamonds in successive amounts to denote lieutenants, captains,
etc. as opposed to the normal insignia.  The rank patches I am looking
to purchase have these OCS rank insignia and are compatible with the
new Army ACU uniform with digital greyish universal camouflage
pattern.  In my experience so far, only commissaries on military bases
sell these elusive versions of the new ACU rank patches.  I am not
looking for regular rank insignias for officers/warrant
officers/enlisted, nor am I looking for non-ACU versions of rank
insignia of any type.

they have them here:
http://www.militaryclothing.com/IBS/SimpleCat/Product/asp/product-id/659873.html

Doesn't list specific ranks, just "OCS"
For the record though, I found what I was looking for at 1800nametapes.com