A shopping spree in Ukraine be a really fun and profitable. However you need to be twice as smart as when you shop in western countries. The quality of the goods can be both really good and really poor. So you need to watch out.
Do not buy imported eletronical articles. Even the prices may seem lower, the models and technology are older. The assortment isn't too great either. E.g. I had a real headache to find a standard network card for a computer.
The crystal is top notch. However I've had some bad experience with some silverware. I've bought a fantastic light crown at a steal. The gold there is great, but be aware of the different color.
I love to buy shirts and ties there, however I've yet to buy a really great dress suite.
Modern shopping centers and western franchises has exploded the last 3 years. However the prices are western as well.