what was he in at your lfs?
in little cups?
how cold is your water?
if he's in a bowl then how cold is your house?
these are all factors that can lead to lethergicity (i think thats a word
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)
also check him for fungus and fin rot (cottony transparent clumps on body/fins/mouth or black/brown/red rotting fins)
sometimes my lfs causes emense stress to their betta in their disgraceful shipping conditions and they lose most if not all of their fish to disease
OR
it could be swim bladder from inadequate feeding
is he having trouble swimming or is he just really mellow
i find the only thing that has cured my lethargic bettas is to put them in my heated tank (in a breeding
NET not a box as they are too small and uncomfortable)
for a week or two until they perk up from the action of other fish around them,
they will soon start to eat again,
feed them blood worms and brine shrimp (i find these are even better then betta flakes and pellets (which i have never had a betta who would eat them)
once they become more acvtive you may return them to their bowl and continue to feed them blood worms and brine shrimp
just make sure they are not in a cold room, as too cold water will cause lethargy again
if your fish has an illness listed above or any other bugs/abbrassions then DO NOT put him in your tank!
and if you don't have a tank then place the bowl in a warmer room, feed blood worms and wrap a blanket around it at night
GOOD LUCK!