The Playtex Insulator Straw Cup in the nine ounce size may be purchased at many mass market retailer locations.  It is a decent cup for those looking for features like spill proof, insulated, refillable, travel, and age appropriate cup for their child or young toddler.  The cup is easy to fill, but hard to clean.  The straw tends to clog up and is terribly frail.  My toddler bit pieces off while using it.  Not a cup that is safe for a teething toddler unless used with extreme supervision.  I was not able to find replacement straws for this model at any store in my local area.  I would only...