The right angle "molex" connectors are available through
www.digi-key.com
Search for item number A14385-ND. The result will come back as "conn plug 4pos 18AWG Mate-N-LO" This connector is made specifically for 18 guage wire. These connectors are $0.47/each.
You must also get a cover for these connectors. Search for item number A255439. The result will come back as "CMNL IDC COVER.
These covers are $0.15 each.
Hope this helps!
Cheers!