Some useful links:
Lower Hudson Valley E-Gift Shop:
The Lower Hudson Valley Paper Model E-Gift Shop - Gallery Models
Murph's Models:
https://murphs-models.webs.com/
Papermodelers downloads:
http://www.papermodelers.com/forum/vbdownloads.php
paper-replika.com:
Latest Paper Model
PRModels:
Home Page - PRmodels
Space Station 42:
http://www.ss42.com/toys.html
UHU02:
http://uhu02.way-nifty.com/
There are lots more out there but those are some of my favorites when browsing for stuff to build.