Digital BW, The Print

Friends, 
maybe I made a mistake, when I dicided to order an Epson 
7500. But now it will be delivered on the 2nd of January.
There are  several reasons why I preferred the 7500, one of them 
beeing the fact, that the 7500 is cheaper than the 7000 overhere 
in Germany.

I believed I could go with MIS VM inks and Paul´s 7000-curves 
but now I realized, that 7000- and 7500-cartridges are different - 
and MIS hasn´t got the 7500 carts in stock.

So I have to find a source for empty 7500 carts and then refill 
them with MIS inks.
Any suggestions where to get them??
TIA
Bernd