These can be purchased via AliExpress. Discovery has many models from inexpensive like this to others at more than twice the cost. I think like anything else, you get what you pay for. I have a more expensive FFP 4.5 to 18 x 44mm that I really like. I think warrantee could be an issue if purchased outside of AliExpress. I have had super good warrantee experience with AliExpress though. Discovery does have models with features that are totally useless, but not so much on their higher end scopes. I am not an expert on scopes, but the value of mine is well over twice the price I paid.