If you want real amateur stuff look no further than here.
You will need to log on and register if you want to buy, but if you just need a look use this
Logon; free
pass; view
Go to the Amateur section, got 281 set/videos compilations. Solo girl, 2 Girl and Boy girl and at prices starting from $5.
Not sure why you need US only, UK our models have full IDs and Model Releases. Our 2257 info is good enough for Hustler.
As for registering, sorry but webmasters with limited time don't want to run around looking at Content Providers sites in the hope they will see something new and suitable. They wants to get update emails showing what's available, before searching. They need to be on the ball and getting the newest and best content for their members.