when you say bigger are you meaning labs or retrievers. I breed jack russells, but even to get a cross breed you will have to pay these days. Farmers are probably best for las or spaniels if you dont want to pay loads, collies are quite cheap but very energetic and bounce all over. If you have any pets at home stores they sometimes have notice boards. Remember though some dogs can suffer from dodgy hips and bones so make sure the parents are hip scored. It really depends what breed you are looking for as where to look, remember to ask all the questions. If you need anymore advice pm me and I'll try and offer any advice I can