Well, you said cheap and occasional. That means an economy PUMP.
1. Remington 870
2. Mossberg 500/590 or 835
3. Winchester 1200/1300
4. Benelli Nova
or on a really tight budget, snag one of the Charles Dalys, or one of the hundreds of old cheap discontinued pump guns seen at any gun show from Stephens, etc., under $175 if you look around.
They will all work.
If you want a semi-auto but can't afford one from BerretaRemBrowNelliChester, then look at the NEF Excel Auto 5, Mossberg 930 (not 935), the Charles Daly, or the CZ 712.
Accoutant at the range? Sure, someones got to keep track of the number of clay birds left.