Sometimes when it comes down to enrichment activities you can buy puppies all kinds of toys but in the end doesn't it always come down to playing with the cardboard box?
Toys and enrichment activities do not need to break the bank. Most times a simple sniffy walk where the puppy gets to decide where to go and what to investigate is a favorite no cost puppy activity.
Common household items can easily be put to use as play items. While seeing a puppy run down the hall in glee with a stolen toilet paper roll might not be a habit you want to encourage, it is ok to just enjoy the moment before finding a way to limit their access to it.
What do you have around the house that a puppy might put to good use?