I built mine using the Igloo Ice Cube linked in the OP, but mine was purchased on sale at Target for something like $18. Not sure why it costs over twice as much now.
The additional costs for the Igloo have already been stated; most of them do not have a drain hole/plug built-in, which means you need to drill one out. There is already a convenient spot on the bulkhead with an appropriate dip on the bottom to help drain to it. It's like they designed it to have the hole & plug, but decided not to add it at the last minute. Anyway, you need to buy parts from your hardware store or some place like bargainfittings to do the cooler bulkhead valve. I think the 60 qt ice cube DOES already have the drain hole/plug in there, though.
The Coleman doesn't insulate quite as well as the Igloo, but it's sufficient for most people's needs and you can adapt it to an MLT a bit more easily than the ice cube. I have brewed using one a couple times over the last few weeks and it worked great. Maintained temps great.Granted, this is in SoCal so the lowest temps on brew day were probably high 50's. I did have to stick something under the back to tilt it a bit so it would drain better when sparging.
The thing that I like about my Ice Cube, though, is that after the mash I clean it out, take it inside and stick the fermenter in there, and fill it up with water so I can control fermentation temps with it. I don't think I could fit a fermenter in the coleman.