damn i bought this marker that looks EXACTLY like a flow pen.. same size of the tube it has a pump system 0.6 inch nib with 2 mixing balls.. just take the ink out because its like a waterbase erasable ink shit and replace it with your own... best thing is its only $1.99 in office max... i forgot the name of the marker cus i took out the label sticker right away but ill find out and put up some pics..
i saw that zig gluemarker thingy didnt buy it cus its $7.00+ and it has no mixing ball..