Good luck on getting a complete Swedish military "Trangia" set up for $20 in the US unless you just get really lucky or something.
Luckily in the UK, we can still get un-issued Swedish Trangia Mess Sets for around $20 and even the heavy duty Stainless Steel (MOD) versions for about $27.
http://www.surplusandoutdoors.com/shop/a...ish-303378.htmlThe Swedish Army Trangia sets are very flexible and have a similar capability to the Trangia 27 versions when it comes to cooking. The sets are very robust and have capabilities over and above the Trangia 27 ( i.e can be used for baking in the embers of a fire) and is still functional when the alcohol fuel runs out (create a small fire inside the windshield and the pots can be used much more easily over a camp fire than a 27 pot or pan). The downside is that the Stainless Steel Swedish Trangia is about a lb heavier than the Trangia 27.
http://www.youtube.com/watch?v=L-GHZ-l_tGwThe fact that they are cheap also means that they can be abused without worrying. Some folks would be unwilling to stick their $140 titanium pots and pans into/over a open fire.