My copy of Shang-Chi Master of Kung Fu Omnibus 3 arrived today via Books Etc, who have done well for themselves so will use them again.
Like Volume 2, this Omnibus is a volume that relative to the price its sold for you can only conclude Marvel want to dissuade you from buying any more because it is kind of slim for a RRP $125 item. The only reason I'm biting the bullet on these is they are low run, one-time print items. Besides I'm now 66% of the way there, 4 omnibuses got, 2 to go.
EDIT: Dealer Alert
A couple of days on, if anyone is still after this, looks to be the best price I can find that has free postage in the UK:
Doctor Strange Omnibus (Lee-Ditko) - £35.12
It's again Books Etc offering it, figure it's worth a try so have bagged it. My recent viewing of Doctor Strange might have had some influence on this matter.