I was raw vegan for a couple years on and off and though I don't recommend the diet, I understand your dilemma and am happy to help.
Buy bulk. I found raw almonds at winco. Having at least a cup or two soaking each day made it easy to whip up a pate or dehydrate a small batch of crackers or cookies.
Carrots. Cheap, even for organic. Carrots have a lot of sugar and calories compared to other raw vegan options, so they're great to fill in a diet low in calories. I did a lot of juice when raw and carrots are always a great base. Carrot/apple/ginger is a really filling juice that isn't expensive. Keep the pulp from the juice to use in dehydrated recipes.
One of my favorite super quick meals was a quarter head of cabbage, 4 carrots, 1 apple - all shredded in a food processor. Top with nama shoyu (sp?), hemp oil, and raisens.
Get your greens. I get 2.5 pound bags of spinach from costco for about $4. Use them in green smoothies, salads, wraps, etc.
As for (un)cookbooks, stay away from the high-end gourmet raw food restaurant ones and stick to more practical ones like Rawvolution.
It's a tough time of year to be raw, but with a lot of planning and chopping, I know it can be done.
Sarah - mama to the love of my life, Aurelia Josephine, b. June 11, 2010