You may find few companies. But I am advicing you to go by Bus or Flight, through a Travel Agent. Because when u reach Mackka, you will have lot of dificulties in finding Hottels, parking & Etc. These days lot of crowd for "Umraa". And also driving is a Risky. You may contact the following Travel Agent, if you ar willing to go buy bus

Doha Group for Haj and Ummra.
Tel: +974 4415779 Fax: +974 423254, Mobile: +974 5560124

http://www.dohagrouptransport.com/contact.htm

Recently I went and came for ummra through the above agent. we got 95% Satisfaction. Rate was 850/= per head.

Good Luck

Pls do not forget to add me and my family name in your Dua