I found some 4 oz bottles with a luer lock bottle cap that takes different sizes of syringe needles. It was advertised for gun oil. Works great with glue tho. I can't remember if I found them on amazon or ebay. The needle that came with mine was a 16 gauge with a blunt tip about 2 inches long.
here is a ebay link. this one says for ink but looks the same as mine
http://www.ebay.com/itm/4-Ink-refill...item19e68f7f35