The type of AM reception you remember was probably centered on dusk-to-dawn
hours.

GE has a portable ($50 to $60) called a Superadio which is VERY good on AM.
Just remember to turn it on its axis to find your station's strongest signal
because the internal antenna is directional.

Most automobile radios are very good on AM too, plus they have the benefit of
digital tuning and readout. They work best with a 30" rod antenna. You can buy
a junk radio from a Chrysler for !$15 at a junkyard; all you need then is a
12volt power supply (1 amp), and speakers.

If you want a table radio with a real DXing "feel" to it, go on EBay and look
for a Hammarlund HQ receiver (140, 145, 150 or 180) but these will cost $200 or
so + shipping.

Just remember that during sunlit hours you'll only get local and semi-local
stations.