I remember seeing these folks advertise somewhere.
http://www.tbaycc.ca/hiddenbay.html

You can also buy a variety of pads from here:
http://www.aerotechdesigns.com/cycling_crotch_pads.htm

I know I don't have the skills to sew on lycra and lycra doesn't like to be sewn too many times to correct mistakes. I'd take it to a professional seamstress or talk to Irulan.