The Army Navy store in Halifax sold bulk packs of these:
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White one, second from the left in the picture...
Sporting Slugs 25 for $19.99
They shot straight but every other one jammed my Mossberg 590 as the extractor tore chunks right out of the case rim leaving it unextracted.

I figured out my costs and reloading slugs with range hulls is $45 for 100
$5 for primers
$2 for wads
$8 for powder
$30 for slugs
if your Mossberg's dual extractors are ripping the rims off your shells, you may want to have a look at your chamber - perhaps it could do with some polishing.
remove the barrel and clean it.
take a small flashlight, and look/feel inside the chamber to check if it is smooth.
smooth = good, rough = bad
this is how it should NOT look (my $300 Dlask barrel):
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