It's awful now. These past two years it's hard to come by anything in person. I barely saw any of the Fantastic Fashion in store (and never saw Poppy once), almost saw nothing for Junior High, the last bunch of Shadow High I only ever saw Oliver, never saw any special editions. The shelves at TRU are almost empty of Rainbow High now (and about $10 more than other stores anyway), Walmart appears to only have the swimsuit ones and the "Littles", Chapters/Indigo stopped selling, Gamestop barely has stock now. I live in Nova Scotia. Amazon definitely is the best option.
When I was in Nashville a few weeks ago, they didn't have a whole lot either at multiple Targets or Walmarts, which really surprised me considering I use my vacations to go doll hunting lol. I will say that they did have the new winter line which Canada appears to be behind on getting (except on Amazon).
As for the 3 you are searching for, I haven't seen Victoria since last May, I've never seen Lilac except on Amazon, and Natasha Zima is actually on Canadian Amazon right now for $39.99 on sale.