not sure on the exact newest blackberry curve model to buy is, but the new blackberry curves currently available are the BlackBerry Curve 8300, BlackBerry Curve 8520, BlackBerry Curve 8900.
the newest blackberry curve 8300 is more of a corporate mobile smart phone to buy, with tracker ball control for ease of use.
the newest blackberry curve 8520 to buy is more dedicated to media playing with media player buttons and a next generation trackpad control.
the newest blackberry curve 8900 to buy is more ease of use orientated and a nice slim smart phone you can buy.
of course this range of blackberry's are very new and will not be in the cheapest to buy online mobile phones, to get cheaper deals when buying mobile phones i think you are best looking at older models of the blackberry phones and not the newest most high tech blackberry curves out.
what you want to do if you want to get a really good blackberry curve but cheap is trackback through the various models and see how the price drops and the technical ability of the phone drops in comparison, if there is little real chage in technical ability of the blackberry phone but the price has dropped significantly then you probably have a good buy there.
other thing is to check out the various range of prices over the various types of blackberry phone model you are looking to buy online.
