If you are in the US and happened to miss Scream Queens the first time around, VH1 is re-airing the episodes. Check the VH1 Scream Queens schedule to find out when.
Although season thirteen of ER hasn't been released to DVD yet, you can catch Lindsay's appearance with Amazon Unbox. Lindsay guest stars on the sixth episode of the season, Heart of the Matter.
EDIT: As Todd has pointed out in the comments section, ER Season 13 has now in fact been released on DVD.