Asos's has a lot of these colours this seaso, not really my cup of tea either.
There are a lot of these types of shirts in th UK at the moment in the shops. Of the shops with US availability, Top Shop have some. I am not sure if they are your thing pattern wise though:
This - http://www.topshop.com/webapp/.....~%5B209729|208524]&noOfRefinements=1
This - http://www.topshop.com/webapp/.....~%5B209729|208524]&noOfRefinements=1
This - http://www.topshop.com/webapp/.....chTerm=tie front&pageSize=20
and there are a couple of floral numbers as well.
I am sure that Urban Outfitters probably have some as well, but I don't think there is parity between UK and USA stock.