This looks like the same one in a different color or at least similar. It looks to me like slip stitched edges, garter stitch and then the cable. If you want more a border do a couple rows of rib like Sue suggested and/or some other stitch.
ETA- okay, that one above is different. It's similar except the borders though. Honestly I'd tell the woman that the pattern isn't for sale so you can't do it exactly like that. You can come close though.
BTW, the price on those is crazy. Way too high for what it looks like to me.