Transposing

I've been asked to sing at our ward's YW in Excellence next Tuesday, as well as with the Primary children at our Christmas Sacrament meeting and then again in the new year at church, so I've been spending alot of time transposing.  One of the major drawbacks with having a low voice is NOTHING is written in my range.  I think maybe it's time to invest in some transposing software - I'd hate to think of all the hours in my life I've spent doing this!