All products on the website are available, although the delivery date may vary. To know if there is availability of a particular item, you should look at its expected delivery date, which you will find on each product page, just below the product name. These dates will give you an estimate of the current availability.
You can also see the delivery date of the product at the checkout step.
If you have more than one product in your basket and these have different delivery dates, you will see the different delivery dates at the checkout step, when you choose the option of partial or full delivery.