#2
im not even sure what thinkgeek is but since you said shipping i tihnk your talking about music equipment like guitar and stuff. if thats so go to musicians friend
#4
You can froogle each item on thinkgeek.com and see who else sells them. Some are unique to that site, but a lot of the products they carry are carried at a lot of other places (and usually for a fair bit cheaper) I'd just froogle it on an item by item basis.