Depending on what age group you have, there are quite a few books available on the internet or some foreign book shops such as the Guangzhou's Tmall one. Some provinces seem to have their own press such as the Hunan one where you can get foreign books "copied" and sold from Changsha. My kids have a lot of books from both of the places. From science to literature, they enjoy all their material that I have gathered for them from around.

Now, the focus on a "speaking textbook" sounds just as a money making candy shop Chinese language school with all due respect to you. The right way to make all kids, regardless of their native language, speak is to provide them with the basic vocabulary on the topics, tell them stories about the topics, buy them those story books, have them watch those (stories) movies, let them speak about those movies and then allow them to write something about them too. Pics speak loud and so pay attention to the stories images in books or on the internet.

So, how difficult is it? Take a "Toy Story" movies for instance. There's a bunch of books available and then there are the "Toy Story" movies. The movie characters are attractive to kids that can even describe them. The better ones may be able to construct a plot of the movie too. This literature is written well and it offers some fine images of the characters and from individual sequels as well. If girls are bored with the topic, introduce "Tinker Bell" movies, and then if those are smaller kids, give them "Mickey Mouse" or "Bubble Guppies" instead. All have some corresponding follow up literature too.

For older primary or early middle school kids, you may want to get them into grammar with some basic "Murphy's Grammar" books as well. Those will probably not be as popular but are a great homework assignment. Just rip the key to answers off in the back of the book, so that they don't cheat. Once they come back with an exercise on present continuous accomplished, for example, give them an oral assignment on the same sort of grammar with a given topic in the classroom then.

Anyhow, the people who wish to have a strict concept with textbooks that outline kids work too much are not usually as successful in the language that requires plenty of opportunities to communicate on topics kids can visualize rather than memorize. Moreover, any language (I suppose) comes with all four reading, writing, listening and speaking all together while the little ones begin with only listening and speaking first. Restricting kids to one or two areas with random topics may not be for their own good.