Still waiting for mine too. The leaflets are everywhere. Mine was in a monthly aero mag. I too scrutinised the ad looking for a catch.
Nothing obvious that I could see. I do wonder though, if this is just an introductory offer and any future models will be priced a lot
higher for anyone who wants them.
This seems to happen regularly, a recent example being diecast tractors, 1/64th scale I think. The first one was a Ferguson
priced at, if I remember correctly, £1.99. The following issues were about £7.99.
Soon find out I expect, if and when the models arrive.