Hey....I like to help!
For my tiny kiddies - I use the Fisher Price Healthy Choices Booster Seat. In Canadian funds, they're about $40 new plus tax, but if you can find them for $15-20 used, you're good to go! I bought mine in the US (as we're 30 minutes away) and bought it for $23.

PM me and I can give you the list that I give to the parents....