Walmart is the largest firearms dealer in US; has roughly one-a-week firearms incidents

[Glassunion]

144. No other comparable retailer?

Costco is a comparable big box retailer. They sell food, general merchandise, clothing, electronics, etc... However, they have a zero guns policy.

Since you want to compare apples to apples I will go back to my post #133 where I stated "If you were to look at the rate according to your count which is about 1 a week you would have an incident rate of 0.0104 per Walmart store."

The problem is, that Costco would have an incident rate of 0.0113 per Costco store.

The fact that Walmart sells guns has nothing to do with firearm issues in their stores. They have money so they get robbed, they have large parking lots for criminals to prey on victims, just the same as Costco does.

Showing my work:
Costco Stores in US: 442 according to their wiki.
Quick Google search found 5 instances of firearm related incidents.
http://www.pegasusnews.com/news/2012/nov/01/frisco-police-seek-costco-robbery-suspect-gun/
http://sandysprings.patch.com/articles/thief-returns-to-costco-with-gun-in-backpack-arrested
http://www.northcoastoregon.com/2012/01/31/warrenton-ask-for-help-in-costco-parking-lot-armed-robbery-investigation/
http://www.examiner.com/article/costco-suffers-armed-robbery-attempt
http://www.registerguard.com/web/news/cityregion/29012046-41/flynn-mckee-police-eugene-prison.html.csp

I'm sure there are more incidents, but 5 was sufficient. But at the end of the day, both the Walmart examples and Costco examples are nothing but anecdotal and the plural of anecdote does not equal a statistic, but since you insisted, I provided.