They chose Zac Carlson in the supplemental draft last season. Picking a player in the supplemental draft means you automatically forfeit your first round pick in the next year’s draft.
The Supplemental Draft is for players who were eligible for the CFL Canadian Draft but their non-import status was unknown until after the draft. These players are made available to CFL teams through a bidding process. Clubs bid one of their Canadian Draft choices the following season; whichever team makes the top offer gets the player and forfeits their draft pick.
Looks like I was wrong about the automatically being a 1st rounder. The same article made reference to the Eskimos bidding a 6th round pick in the 2007 draft to get Jermaine Lee in the supplemental draft in 2006.