Did you ever notice that some things are crazy expensive depending on what you call them? For example, call a party a wedding and you are in over your head... Sparkling wine or Champagne? Suit or Tuxedo?
Yoga block or block of foam for yoga...?!
Well as it happened this foam really is a good dense and high quality foam... and it is perfect for yoga. But for $8.99 a block lets call it .... a very good deal.