I have two suggestions for you. You can try Daisy directly at their Customer Service (See the link below) or another web link that offers all sorts of air gun repairs. See Link #2 below.
Contact Daisy directly (Customer Service) and select the parts manual. See the link below.
go to Ronnie Sunshines on the internet and type in daisy powerline 880 you can get one for about £40
Yes.
The current price for the Daisy 880s with scope is about $48
It was made between 1977 to 1989
No it's a spring piston system
Do a web search for "Airgun repair' there are several places that repair airguns.
I do not recommend it. Its not quite powerful enough
Because it is designed to shoot.
No. Its just a 15 shot BB gun.
No it is not designed to shoot pellets.