Thanks. Will update these.
Problem is I need to do fussy search using keywords. And the sellers tries to get as many matches as possible (they add a lot of keywords thats not even describe their product). The ali-database is updated constantly. Gah.
(yeah, this is really old in tech years, but I post in the event someone stumbles upon this.) I actually tried the GPS suggestion. I was wrong about the error between two identical GPS's. It's quite large. Check out the other suggestion first.