Beware Walmart sells out dated cartridges. Costco has fresh and may have sales every other month or so. Best to watch Costco paper.
Costco does cartridge refills for around $10.
Always ask. They may say yes
There is no price match at Costco. There are occasions when other retailers have a lower price due to a sale, however Costco's everyday prices are generally the most competitive.
No they don't do but at least you can try and ask them
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