I like any cookbook by Molly Katzen which are usually vegetarian cookbooks. Some are specifically lowfat. I also like a cookbook called "Cheap, Fast, Good" by Beverly Mills. It isn't all lowfat but you can easily tweak them to be. Good luck!
I have the luxury to not have to be very frugal in this horrific economy. but that doesn't mean I waste money either. I buy mostly of off brand stuff, but I love great tasting food. So I apologize in case my ideas don't fit your budget. I post a new dish every wednesday and I am sure you could tweak them. I also get alot of ideas off the eating well website, and for sam zein the cooking guy on discoveryhealth.com happy cooking!!!!
Have you tried the blog $5 dinners?