Home bakeries or from shops. I think rice gauche is not bad. If you want specially designed cake, try bakeries like Charlotte Grace or search online
Edith Patisserie, their cake is nice and flavour unique nit too sweet. Bakersbrew have various cartoon character design for kids too can email them
You can consider Edith Patisserie (: they have regular and customized ones. Prices are quite reasonable and I find their cakes yummy.