Help! Need oversized / giant / jumbo blocks

We have a wonderful set of oversized blocks, looking for more like them.  
Found at a garage sale.  They bear NO logo or identifying marks, I assume
they are some kind of illegal knock-off since they use Lego-type
technology.  But they're great for small kids.  Lego should make them!  
Each is about 3 by 6 inches, maybe 3 inches high (I'm guessing).  With more
of them, we could make HUGE structures :)

Please reply to this email:

spammerstakeahike_ness@willowmountain.com
(minus the obvious)

Thank you!