You will not get 30 filters at that price. If you look at every single online Honda parts website, they put that in the description of the filter. They're simply stating that they also offer them in multiples of 30. Buying that item will get you as many filters as you specify in quantity. You will
not get 30 filters at that price. It's simply poorly worded and in this case for more than 20 dollars for a single oil filter, over priced.
You can prove this by looking on the site for the actual 30 filter pack and comparing the price. Using BernardiParts as an example, they have the same text:
#007
FILTER, OIL (HONEYWELL) (SOLD IN MULTIPLES OF 30)
Part Number: 15400-PLM-A02
Price: $7.30 $5.12
You Save: $2.18
Except the price is much lower so you're less likely to believe you get 30 filters for $5.12.
If you then navigate to the maintenance section of BernardiParts, they show an actual pack of 30 filters, the price? $139.50.
https://www.bernardiparts.com/Honda-Genu...ILTER-PACK.aspx
So no you won't get 30 filters and yes Sons Honda is overpriced.