Hi Teresa,
I think what you're looking for are product upgrades, and yes, we do have upgrade options available. The upgrades available for you (depending on the product you initially bought) will be displayed in a "Your Upgrade Offers" section in the Online Store's home page, which will be visible only to you when you're signed in to your BrillKids Account.
You may choose to get Little Reader Basic with Sem 1 content only for now, and you will have the option to upgrade to Sem 2 or Deluxe. In case you choose to get Little Reader Basic with Sem 1+2 content instead, you will still have an option to upgrade to Deluxe. The upgrade price will depend on which product you want to upgrade to, and you will see this information once you purchase LR Basic. The storybooks included in Little Reader Deluxe are not sold separately, unfortunately, but you will be able to get these (and the other items included in Deluxe) when you upgrade to Deluxe later on.
Regarding other storybooks, you may consider getting our Aesop's Fables storybooks (there are 2 volumes available) which you can buy separately -- please check our Online Store's
"Teaching Tools" section for details.
I hope this helps!