I have a feeling these are all available through Cheapest NATO Straps - but there may be other purveyors.
Sure thing: I got them from blipshift.com for $12 each after I saw them advertised in Road and Track mag. Just went back to the site and can't locate them right now.
Heh I have a Gulf NATO. Been wanting a Martini for a while but have not made a bulk strap purchase for a while now. But I am due... And yeah like @wilderbeast said I'm pretty sure all of these can be had at Cheapest NATO Straps. That is where I do my "bulk" buys.