I have an automated search tool for finding new Amazon listings. Saves me a lot of effort when tracking down new title listings for the stats site. The most recent 'finds' are listed on the main page of the stats site...
It is region free and as such should work in your US PS3.
If you click on the title on the import page (or Buy on the Amazon UK page) it will take you to the Amazon UK page - I believe they ship to the USA. The Amazon UK page has a better estimate of the current exchange rate/ USD price than the import page which is sadly out of date and needs work.
There are places other than Amazon UK also if you want to look around.
I believe Ronin is coded Region B and will most likely not play in a US player. I would not recommend importing that one. The ones with a Red background on the Amazon UK page have been reported as coded for Region B only.
You should have time to change your order. Hope that helps.