I was at Wallgreens today, and I found these pens here

they are called "pioneer acid free gel ink pens" B)
They look exactly like the uniball signo from the picture, but I don't know if the size is the same these are pens about 13.5 cm long

at the walgreens and I can get a pack of 4, for like $2 USD.where as I can only buy a single uniball signo DX from jetpens for around the same price.
You can buy them here:
http://www.walgreens.com/store/product.jsp...&id=prod923739#But you could always find out more about them on google.