Ok well I just thought I would let everyone in on some tips. I went to Wal-Mart today and bought my Thermos's I bought two of the Cambells soup thermos's. The were $3.94 each, I don't think you can get them any cheaper on-line. I found them in the kitchen section, where they have all the tupperware and such. I also ordered some boxes from USPS. The boxes are free, but take a few weeks to be delivered so order now. Finally I read that if you fill the thermos with very hot water, for 20-30 mintues prior to adding the frag, it will help the thermos stay warmer. Of course you pour out the water before you add the frag. Well here are some links to the boxes and pics of what thermos I bought.
If you have a big thermos I would use this box
My thermos should fit in this box
And finally here is the link to order, but order soon so they get to you in time. You can also usually go get them at the post office. But mine does not stock boxes for some reason. HTH.
http://shop.usps.com/cgi-bin/vsbv/po.../Priority+Mail