From my research a while ago the key to heat retention is the vacuum seal. If they don't say vacuum seal then you may not have warm coffee for a while.
I got frustrated with trying to find the Contigo so about a year ago I went to either Target or Walmart to the camping section and found a decent selection of containers. I went with a good old fashion Thermos brand that had dual steel wall with vacuum in between. It took a while to translate the "how many hours warm" numbers but I was able to finally figure out that vacuum was about 24-48 hours (or some silly like that) while non vacuum were 6 to 8 or 8 to 12.
Anyway, my Thermos is pretty good. Nothing fancy - just a screw top and a screw in stopper. It can leak if I'm not careful but it's about as leak proof as it gets. So I guess I'm saying to give the camping department a try and look for a plain old Thermos.