I saw this one for five bucks (which is internal):
http://www.amazon.com/Music-Converter-Keyboard-Supports-Window/dp/B003XTX09S

and this one which is over seventy:
http://www.google.com/products/catalog?q=midi+to+usb&hl=en&safe=active&rlz=1C1CHF X_enUS453US453&nord=1&prmd=imvnsfd&bav=on.2,or.r_g c.r_pw.,cf.osb&biw=1024&bih=640&ion=1&um=1&ie=UTF-8&tbm=shop&cid=6563099724576316069&sa=X&ei=lsetToX cM-f10gG15YmXDQ&ved=0CNYBEPMCMAk4Cg

What's the difference between to two and can I use the first on for connectivity between my keyboard and fruity loops?