Stash search cannot count mods, but 8-mod maps almost always roll 100%+ quantity. Trade searches use the real mod count.
Buy maps searches the trade site for T16 8-mod regular maps, with 100%+ quantity, cheapest first. Another tier, map family or price range is one paste away in the generator.
Nothing in a map’s text says how many mods it rolled, so no stash search can count them. What players mean by an 8-mod map is a fully rolled one, and the readable sign of that is Item Quantity. This regex keeps maps at 100% quantity or more, which is where a full set of prefixes and suffixes usually lands. A map with eight weak rolls can still slip past it. For the exact count, use Buy maps: the trade site knows how many mods a map has, your stash tab does not.