Yea mossberg has a bantum 500 all black 20ga i believe a 22 or 24'' smoothe bore barrel list is about 269.99.
Depending on LOP needed you could try their 500 20g which is 249.99 for one barrel or 349.99 for the combo with a 2.5 power scope.
The 500 bantum should hold up great for what you are looking for though.