There is an article at overclockers that describes building a linear supply for a TEC. It's not adjustable though.
Doing it right though will be more expensive than just buying a switcher. The efficiency will suck too.
To vary the output of such a linear supply, you would want to connect a variac to its input. Regulating the output voltage on the output side of the supply will dissipate way too much power. You need to regulate the AC input. That is what the variac is for.
BTW, I happen to have a variac available that could do the job.
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