I live in Ontario, Canada, the biggest "gun" you can get here is a crossman pellet gun at the Wal-Marts here

I priced out the Rifled 870 Deer vs the Smoothbore 870 Deer at some stores here (LeBaron, BassPro and a few others) and the 870 I bought was the cheapest I could get at $326, the cheapest 870 with a fully rifled barrel was $445. I can buy a fully rifled slug barrel for my gun for about $145.