The company is 'Tweet Tweet Home'. The DIY birdhouses are made of recycled plastic and come in two shapes-classic and cone. They are available in a wide variety of fun colors and designs. A great summer project! Tweet Tweet Homes are supposed to be easy enough that young children can assemble with adult help.
A quick search of "Tweet Tweet Homes birdhouses" show lots of online stores that sell this product (the company does not sell directly to consumers). Prices ranged from $9-$14.