$10 flex pen

if you go to flea markets there are a large selection of pens that can be had for $1  many of the pens from the 20's and 30's will take Fountain Pen Revolutions steel flex nibs.  these cheap indian nibs can be had for $7 and perform about as well as noodler's flex nibs.  the trick is to take a dremel and sand the nib back in certain areas to increase the ease of flexibility of the nib.  i will cover more on that later.
i have yet to get a true wet noodle nib but i have had some that flex on the down strokes without applying pressure