I'm sure I put a link up sometime ago about Nightvision range finders from China.
On that link was a whole range of "unbranded" rifle and Nightvision scopes
All available at single purchase unlike bulk buying off alibaba. However..!!!! If you contact a lot of these Chinese suppliers/manufacturers and ask to purchase a sample rather than 20,000 units most will be accommodating.
The resemblance of some "unbranded" items and "branded" items is uncanny........cough cough!!..........