Yes, the blocks for this shaker are sold separately. Product Z755796 will hold 1 PCR plate or 96 x 0.2 ml tubes. Please see the link below to review this product:
https://www.sigmaaldrich.com/product/aldrich/z755796
Product Z742456 will hold a 96 well deepwell plate. Please see the link below to review this product:
https://www.sigmaaldrich.com/product/aldrich/z742456
Please see the link below to review all of the blocks available for the MultiTherm shaker:
https://www.sigmaaldrich.com/US/en/substance/blockformultithermshaker1234598765