Primers on the Auction Site

I'm clearly not new to reloading and not a virgin to new normal pricing, but the auction site is certainly new deep waters for me. After looking around at the primer prices I (as expected) needed to take a shower

That having been said, some/most quote shipping prices, generally in the $25 range. Before I make a donkey of myself pinging every seller, as a general rule are HAZMAT charges additional and unstated, requiring me to ping every seller? Or if not stated is it understood/inferred HAZMAT is included in the selling price (I use that term loosely) whether winning an auction or "Buy Now"? If the latter, I'd surely follow up with the confirmation before tendering a reasonable, if laughable offer.

-jb, looking for new definition of "selling" prices

Thanks folks, about what I was expecting. A while back I was close to buying a high dollar custom rifle until I had to factor in the federal excise tax. Wait. Don't all manufacturers have this included because it's universal to all firearms?
Anyway, being a new guy at auctions, I didn't want to be marked as a "mark," thanks. The site is (I was thinking it might not be agreeable to name a site) of course gunbroker.

-jb, adding shipping, sales tax, HAZMAT, day of the week, phase of the moon and ...

Analog, what happens if the shipment is discovered? Does it get confiscated? Who is on the hook, buyer or seller?
I'd sure hate to have some poor FedEx guy tossing primers around like my boxes usually show up

-jb, rather not having boxes with scorch marks