I know nothing about those particular models, but will give you some of my past industry observations. At the online places, they always hit the market at about full retail and then drop off about a month later. Depending on the popularity, it will fluctuate some during its lif cycle. About the time a replacement is introduced, the price seems to freeze until the new model has been out for a couple of weeks and then it will usually lower some more. It then usu. takes another small reduction but eventually ends up back at retail or even higher once the supply is really low.
This is not a rule though. Different things can happen and I have even seen prices go up after a replacement is introduced. This also does not take sales in to account. That one is currently $20 less than Buydig(usu. lowest online reputable price), and not all that expensive to begin with, so I bet that even if it does go down, it will not go by much. If you really want it, I say go ahead and get it. If you have the self control to not open and use it, you could buy from them and hold on to it until about when the return policy expires to see if a cheaper offer comes along. I do not have that amount of willpower myself.
Kevin