AnswerI wouldn't say they're "popular" because more of the flashy plastic "themed" toys tend to be more "popular" nowadays, but I can say as a parent of two toddlers that they are wonderful for kids to play with. It forces imagination (whereas a lot of toys nowadays limit it because there's one set thing to do with the toy), are virtually indestructible, and will last them for years as their imagination changes and matures.

AnswerThere are many ideas at local hardware stores. Look through the many aisles and take pictures of everything you like. Then, go home and decide between all of them.

AnswerComforter sets from several stores can be offered with free shipping, like Anna's or Walmart. Sometimes the stores specify a purchase limit in order to get free shipping. Most retail stores like Sears or Walmart will offer the choice of instore pickup which will save shipping costs.