Okay, this is more of a "Not Cheap But Hard to Get" Deal, but Midway has the Aquila 1-3/4" Mini Shells in
stock.
$18.79 for a box of 20 (90 cents a round).
https://www.midwayusa.com/12-gauge-1-3-and-474/br?cid=23047
They've sold out of the shotshells (they go quick), but the 7/8" rifled slugs are still available.
They work with stock Remington 1100's and Kel-Tec KSG's but do work in Mossberg 500's with the adapter plug.
stock.
$18.79 for a box of 20 (90 cents a round).
https://www.midwayusa.com/12-gauge-1-3-and-474/br?cid=23047
They've sold out of the shotshells (they go quick), but the 7/8" rifled slugs are still available.
They work with stock Remington 1100's and Kel-Tec KSG's but do work in Mossberg 500's with the adapter plug.