Has anyone checked out these foods at
Dog Food Analysis - Reviews of kibble ?
I know it's not the only source out there, but it's a good site to check & compare the ingredients of the different foods available on the market. Some YT'ers don't agree with their ratings system, so be your own judge. A 6 star food is too rich for yorkies-it's meant for a large working breed dog, but anything in the 4-5 star categories are probably great places to start.
I homecook now, (But feed meats raw), and I got started about a year ago. It doesn't take that much time-probably about 1-2 hours a month (as much time as it would take me to get to/from and through Petsmart anyway), and I can buy their food right alongside ours in any grocery store. I feed meats, legumes, and some grains-the legumes boost protein and are fairly inexpensive as are grains and veggies. The meat & the supplements are the most expensive part, but when you realize how little a yorkie actually eats per day, it's not that bad.