They are easy to make on your own with a posterboard, marker, and ruler. Just make a grid, write the days of the week across the top, and the chores in each column to the left. Kids love stickers, so every time that she does one of her chores, let her pick out the sticker that goes in the box for the specific chore. My kids look forward just to filling up the spaces with cool stickers, and sometimes that is all the motivation they needed to do what they were asked. It's also a modest reward, so that they don't expect something big everytime they do what they are asked to do. I think that 15 months is a bit young to start on chores, but I guess it depends on what you would consider "chores" for her. Most kids that age don't completely understand what adults are talking about, so I don't have any ideas of what to even put on a chart for her. Their attention span is very limited. If you are just wanting her to be included in the "reward" aspect of it, you could make a chart of things she learns/learns to do, and let her put stickers when she learns them (like where her nose is, saying new words, etc.) Your 3 year old, on the other hand, is old enough to understand simple chores, like picking up her toys, putting her dirty clothes in a basket, or even simple things like wiping off the table with a dish rag, things like that. You may consider having a column for stickers when she is "Mommy's Big Helper", like when she helps you at the store as you described. Just a few thoughts that came to mind that might help you get started. Good luck!