I think you'll need to make a more vailant effort on your own before tossing the board a wide open question like this. MR folk don't take very kindly to "I need to do a MR...what should I do" kinds of requests. Try reading the stickies at the top of the forum, then work on some routings yourself. MR experts will be glad to critique, offer other suggestions, etc., but not to do the searching for you. Besides, you say you're "not particularly flexible" without giving any idea of what that means. How can anyone make suggestions unless they have times and dates that work for you?

Try farecompare.com for a start. and the ITA website mentioned in the sticky.

Good luck.