For the ink and kit from InkRepublic.com, the price of $275 is not only 600ml dye ink, but also their "kit" - bulk ink system.
their ink is pretty cheap and the quality is as good as Epson's.
If you do some calculation, you will know you can save tons of money.
if you have bought the 2 sets of ink cartridges for your R200/R300 or other system, you can actually use those money to buy a system from InkRepublic.com, besides you can get so much more ink from them rather than a cartridge (13ml at most)
http://www.inkrepublic.com/ink.asp?item=D100
http://www.inkrepublic.com/ink.asp?item=P050
their dye ink is 13.95/100ml, pigment ink is $14.30/50ml
plus it's FREE shipping, I guess it's nothing but Good Deal..... unbeatable....
all you need is to pay for the bulk ink system, and it's one time only charge. no mention about you can actually use the same unit on R300, RX500, RX600, even R800, R1800 ...etc. Their parts can be used on different models. In a long run, it can save much more than you could expect.