I found an extendable, 30" telescoping wand with a 1"+, round mirror
(the kind you look in/around/under engines, hard to reach places,
and down car door cavities with) at a "Cracker Barrel" restaurant,
gift shop, for $2.00.
('Cracker Barrels' are all over the interstate highway 'off-ramps' in the East)
This can be used to look at the bottoms of feet, for a reasonable price.
I use it for work purposes, frequently. (I bought 2- 1 for home, too- they also
have the same wand with a magnet at the end, same price)