I swear it's getting harder and harder to find Lego compatible mini figures for cheap now on Aliexpress. They used to be all over the place but now, with the added shipping costs, prices for mini figures have ballooned to about $2.50 to $3.00 each
But I found one Aliexpress store that still has mini figures for cheap. It's called the Building block toy store and it has a fairly decent feedback rating. The listing has a set of 8 mini figures for $4.60 + $0.42 shipping which adds up to about $5 CDN, even cheaper in USD.
From the picture they look to be characters from the PUBG series (Players Unknown Battleground) game. There are seven males and one female, all holding weapons. You won't find these in any Lego store, lol.
Anyways, if you are interested in populating your Lego city or battlefronts with some low cost mini figures, feel free to click the link that will take you directly to the Aliexpress store listing: https://s.click.aliexpress.com/e/_AcyPNV.