Mine favor brocolli, spinach, carrots and pea pods (sugar snap or snow peas). They also really like beans, rice and pasta. Dried beans are real cheap. I just make a batch about once a week and freeze little butter tubs or beans. I switch between fresh veggies and beans and rice. pasta only every once in a while. I hang fresh veggies on a kabob and hang it where I hang the millet. So the millet is every other day as well.
The joy of providing Birdie toys is half the fun. I found that http://www.cabirdnerds.com/ has lots of wonderful toy parts for putting your own toys together. No affiliation, just a fun place to shop.