Cheapest yerba mate in Ireland

What the numbers say

• The cheapest yerba in Ireland is Rosamonte Tradicional 1kg at Amazon.ie, €9.99 per kilo. That price only holds if delivery is free, and Amazon.ie's free-delivery bar is €25.00 — so you need 3 bags in the basket before €9.99 per kilo is what you actually pay. Buying one bag on its own is a different, and much worse, deal.
• The same bag can cost 158% more depending on where you click. Rosamonte Tradicional 500g runs from €12.00 per kilo at Almacén Argentino to €31.00 at Amazon.ie, and Canarias Tradicional 500g is not far behind at 142%. Identical product, identical weight — the only difference is the listing.
• Always buy the kilo. The median 1kg bag we track costs €11.00 per kilo; the median 500g bag costs €12.80 per kilo. That is 14% more for the privilege of a smaller bag, and it holds at every shop in the table, without exception.
• Three Spoons wins at one kilo and Amazon.ie wins at ten. One kilo delivered costs €17.45 at Three Spoons (€17.45 per kilo, delivery included); ten kilos costs €99.90 at Amazon.ie, or €9.99 per kilo. Same shops, same shelf prices, opposite answers.
• Three bags is where the free-delivery bar starts paying. 3 × Rosamonte Tradicional 1kg at Amazon.ie comes to €29.97, which clears that shop's €25.00 bar, so the shelf price and the price you pay are the same number: €9.99 per kilo. Buy one bag instead and the same yerba costs whatever delivery turns out to be.
• 8 of the 62 offers are out of stock today. They stay in the table, greyed out and pushed to the bottom, so you can see what a shop normally charges rather than only what it happens to have on the shelf.