de lo barato:
Edirol
http://www.preciomania.com/search_getprod.php/masterid=16374548//
Mackie
http://www.musik-produktiv.com/shop2/shop04.asp/artnr/100032277/sid/!x11esesc/quelle/listen
M-Audio
http://la.m-audio.com/products/es_la/FastTrackPro-main.html
Alesis
http://www.musiciansbuy.com/Alesis_IO14_14_Channel_Digital_Audio_Computer_Interface_with_Free_IO14KIT.html
Edirol
http://www.dooyoo.es/tarjetas-de-sonido/edirol-fa-101/
Un poco mas caro: #-o
Presonus
http://www.presonus.com/firebox.html
Motu
http://www.futuremusic-es.com/modules/news/article.php?storyid=51
RME
http://www.rme-audio.com/english/firewire/ff400.htm
Y si algun dia se te mete en el coco gastar mucho dinero:
Universal Audio
http://www.uaudio.com/products/digital/2192/index.html
Saludos