Just picked up 400 100m capsules of Kirkland brand Docusate sodium (i.e. generic Colase) for about $5 at Costco. As I recall this is about 1/10th or less than the Colase brand name product at the drug store. They also have 1300m Flax Oil gelcaps - just started with those today. I already use their Fish Oil gel caps.
If you have a Costco nearby might be worth checking into if you need Colase or some of the other supplements.

Great tip-Ouch. I love Costco. Wish we had one in this neck of the woods!