OP, I really sympathize ... I haven't seen a roach since the late '80s when I lived in Berkeley ... we didn't have any 'til we got new neighbors and suddenly our apartment was totally infested.
I think they may have brought them in on their furniture. We finally got rid of them by using boric acid throughout the kitchen cabinets & counters -- we didn't have any pets to worry about.
I lived for a few more years in Berkeley, then 9 years in Michigan and now 12 years in New Hampshire and have never seen one since. Maybe they don't like the cold?
I am grateful!!