i am absolutely in love with my pentax k1000
you find them for pretty cheap, and the lenses....
rugged, tough camera...
it uses a single battery for the light meter, but the camera itself requires no battery to operate.
it is completely 100% manual.... no auto-anything
this was (is) my first SLR, got it a few months ago now, and i love using it... and love the results...
makes me feel like a
real photographer

i think (hope) i have learnt some things using this camera...
i have a reasonable digital camera too (Sony F717) which i love... but there is something truly magical about my K1000