The Plastic Soldier Company, which makes various World War II figures in 1/100, 1/72 scale and 28mm size, is currently running a sale on their 1/100 scale models, which are suitable for 15mm gaming. 30% off, which works out to 10% off after shipping to the US. (unless they discount for VAT for out of EU folks?)
A nice thing about their models, at least in the 15mm compatible 1/100 models, is that they usually come with more than one vehicle variant on the sprue, so if you only need one Panther A, and three Panther Ds, you can do that with the parts included in the box.
|Panther Sprue guide|
Just because I should not, does not mean you can not, so go on over to the Plastic Soldier company and pick something up. (And they also sell models by other companies like Zvezda to fill in gaps in their line)