Got the last skein for my vest today! It wasn't fun to run out of yarn on a Saturday night because the shop doesn't open again until Tuesday. I have literally inches to go with the side I-cord, I may or may not do them for the arms.
The pattern said to go back and forth with the circular needle, but that was a bit fussy for me. I got out my DPN's and knit the I-cord that way. I'd knit 3, purl2tog then put the yarn in back, slip one from the circular needle, slide the stitches to the right and repeat.