Generally speaking: How fast do you expect current tablets to get cheaper?

I'm on the verge of buying a Windows 8 tablet with stylus support. However I have the feeling that they all are a little too pricey (and I actually don't have 700 or 800€ to spend right now).
So how fast, drawing conclusions from the past, do you expect devices like the Samsung 500T or the Thinkpad Tablet 2 to get cheaper?

Does anyone have any insight in this?