Quite a few products on the market:
- Extron RGB-HDMI 300 A, http://www.extron.com/product/product.aspx?id=rgbhdmi300a
- Aurora ASP-VTH, http://www.bhphotovideo.com/c/product/759572-REG/Aurora_Multimedia_ASP_VTH_VGA_Audio_to.html
- Atlona AT-HD500, http://www.bhphotovideo.com/c/product/814499-REG/Atlona_AT_HD500_PC_Laptop_to.html
- Kanex VGARLHD, http://www.bhphotovideo.com/c/product/798483-REG/KanexPro_VGARLHD_VGA_to_HDMI_with.html
- Aluratek AVH100F, http://www.bhphotovideo.com/c/product/638200-REG/Aluratek_AVH100F_AVH100F_VGA_to_HDMI.html