Mouser has them: for less than $2.00 each. The secondary locks are less the 50 cents each, shipping is flat rate USPS.
http://www.mouser.com/ProductDetail/Del ... a3cZvqE%3d

http://www.mouser.com/ProductDetail/Del ... ZAe21VE%3d

http://www.mouser.com/ProductDetail/Del ... IvQQ%3d%3d

http://www.mouser.com/ProductDetail/Del ... DygA%3d%3d


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