To get a good riding and affordable kids bike, consider the following:

Choose a bike that suits your child's age and height: choose the right size of bike for your child's age and height to ensure that your child can ride comfortably.

Buy a bike with a reputable brand: choose a bike from a well-known brand, which usually have better quality assurance and after-sales service.

Compare prices and value for money: Compare the prices of different brands and models of bikes across multiple sources and choose the one that offers better value for money.

Consider second-hand bikes: If you are on a limited budget, you can consider buying second-hand bikes. However, make sure the bike is of good quality with no obvious damage or faults.

Go to a brick-and-mortar store for a test ride: It is best to take your child along to a brick-and-mortar store to try out the bike and see if he or she is able to grasp and ride it with ease.

Refer to other parents' evaluation and experience: you can ask other parents about their experience and evaluation of buying children's bicycles and get their recommendations and suggestions.

In short, when buying a children's bike, you should consider the price, brand, quality and the actual needs of your child to choose the right bike.