Aldi Vs Costco: Which Sells Cheaper Irish Butter?

When it comes to butter, not all brands are made equal. Interestingly enough, Irish (and really any European-style butter in general) differs greatly from American butter, as it contains a higher percentage of butterfat. Whereas American butter typically contains about 80% butterfat, this imported European butter is required by law to contain at least 82%. With an intense richness and added softness thanks to the extra fat, Irish butter is often the clear winner in terms of both taste and texture. But where can you purchase Irish butter at an affordable price, you may ask? While both Aldi and Costco sell Irish butter, Costco's unrivaled bulk prices mean that this wholesale retailer comes in first with the more affordable option.  

Aldi only offers shoppers one brand of butter from Countryside Creamery, but Costco actually carries two Irish brands now, thanks to a recent switch in dairy manufacturers used to create its Kirkland Signature Grass-Fed Butter. And while Aldi doesn't typically carry unsalted Irish butter options, Costco does. This fact may not seem to matter if you are simply looking for a quality savory butter to spread on your morning toast, but unsalted Irish butter comes in handy particularly when used in baking — from cookies to cakes, and even laminated pastries like croissants and Danishes.

Aldi's selection of Irish butter is quite minimal. With only one product from Countryside Creamery labeled as pure Irish butter, this product comes in an eight ounce block priced at $4.39, or 55 cents an ounce. On the other hand, Costco generally stocks its shelves with two brands of Irish butter: Kerrygold (salted and unsalted), and now Kirkland Signature Grass-Fed Butter (salted). At this wholesale club, Kerrygold butter is sold in a pack of four, eight ounce blocks at $14.99; that's only around $3.75 for eight ounces, or 47 cents an ounce! 

But for an even better deal on salted Irish butter, Costco's Kirkland brand of grass-fed butter comes in at $10.99 for the same 4-pack of eight ounce blocks — that comes in at just 35 cents per ounce. And it should be noted that this Kirkland brand of grass-fed butter was not always sourced straight from Ireland. While the dairy used in this product was once imported from New Zealand, it now comes from Irish dairy co-op Tirlán after a deal was struck between Costco and Tirlán in the summer of 2026. 

So while shoppers should consider that Aldi discount supermarket has a good number of worthwhile groceries, such as its store-brand coffee products sourced from Germany or its affordable chocolate candy that rivals Lindt's, the bottom line is that Costco is by far the cheapest option when it comes to Irish butter.