Dell printer cartriges, come in a wide variaty of cost levels. Depending on the type of cartridge you need, ie black in or coloued ink. Also the size of the cartridge needed, to suit your printer.
"Yes, Dell cartridges are refillable. The process is a little messy, but it can be done. It is probably a better choice to purchase it from a retail store."
Dell printer cartridges can be obtained directly from Dell's official site, as well as from other retail sites that carry a selection of cartridges from multiple companies.
Most printer ink cartridges can be refilled these days, but they can be quite costly depending on your location because of travel costs. It may be best to buy a new cartridge, but ask different...
Walmart sells all kinds of computer stuff and different brands at different times. So they should have a cartridge for a Dell, but it may not be made by Dell.
You can get a cheap printer cartridge at any business or office supply store. Such stores would be Office Max, Staples, or Office Depot. They all carry this product.