I haven't used them in a long while, but if I was looking right downtown I'd talk to CustomColor to see if they will meet your needs:

http://www.customcolorprolab.com/index.lasso

Otherwise, I'd suggest either ABC Photocolour:

http://www.abcphoto.com/index.jsp

or G King Photo:

http://www.gkingphoto.com/index.htm

both of whom are just slightly outside of the downtown area.

Hope you enjoy your visit.

Matt