Originally Posted by
EsherFlyer
The regular price over at IB is within 0.1p of that if you buy in bulk (EUR1800 / 100k Avios), so I tend to find not much point waiting for the BA Avios sales (esp. given that the IB sales get down to ~1.0p).
It was mentioned discretely:
http://www.flyertalk.com/forum/25096512-post1.html
I would also highly recommend keeping a check on headforpoints.com where Raffles provides a good insight into many of the best offers. You can also subscribe to the daily emails.