Welcome to the forum.

Unless you buy used or NOS parts, you are unlikely to save money by building your own bike. If you can do your own work, you may want to consider buying a complete bike from one of the online retailers. since you can get the frame and components for cheaper than you can get them individually, and then ensure that the parts are adjusted properly, which is usually the downside of ordering online.

Remember, frame, group, bars, wheels, cables, tape, saddle... it all adds up.

Complete bikes at Nashbar.com, performancebike.com, bikesdirect.com and other sources, along with Ebay could potentially do you better than building from scratch.