Understandable, but the money you can save on buying parts is worth it and they're usually very good with shipping orders quickly. Here, I'll list some prices on newegg.
Ram - G. Skill 2x2gb DDR2 800 $49
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231122
GPU - EVGA 9800 gt $110
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130380
- or Gigabyte 4850 $120 (more powerful)
http://www.newegg.com/Product/Product.aspx?Item=N82E16814125236
LG DVD burner - $25
http://www.newegg.com/Product/Product.aspx?Item=N82E16827136144
DVD drive - $20
http://www.newegg.com/Product/Product.aspx?Item=N82E16827106275
Sound card - Usually you can find it included on motherboards







