Do You Combine Shipping for Multiple Auction Winner?

I just won a couple of auctions, 88-89 Fleer Kareem SGC96 and a 88-89 Fleer Jordan PSA 9. The descriptions don't say combined shipping, so is it bad etiquette to ask the seller to combine?
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Always looking for Topps Salesman Samples, pre '51 unopened packs, E90-2, E91a, N690 Kalamazoo Bats, and T204 Square Frame Ramly's
Just my 2 cents.
As a seller, I used to combine whether I was asked or not.
Since I started using "free" shipping, the question never comes up.
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Sellers and buyers may note: "Free" shipping likely negatively
impacts many buyers. The mailing-cost is built into the item; if
a buyer buys multiple items, that cost is built into EACH item.
As a seller, I explicity state in my auctions that I combine and what the combine rates are.