Look in your library for a copy of The Blue Book of Gun Values. You'll find information on hundreds of single shot guns.
If your rifle is a single shot rolling block type rifle, it was probably made by the J. Stevens Arms & Tool Company. These were made for hardware stores under the Marvel brand, and PROBABLY dates to the early 1900s. Not a great deal of information out there.
Proofhouse.com has a store brand name chart that will assist you.
Sounds like a store brand. Value in the 25-75 USD range.
--------SAVAGE 3 SERIES Rifle Information-------- There were several variations of the Savage model 3 rifle made. The basic version is a single shot bolt action, .22RF chambered rifle. It appears that all variations of the M3 were single shot and that the added model variation such as
Proofhouse.com has a store brand chart that might help
Search the internet and see if there are any collector sites for Ranger
Egunparts has a store brand table that might help
Need to know exactly which model it is. sales@countrygunsmith.net
Without a lot of luck, and a lot more information, this may not be possible to answer. Sport is not a well known "house" brand, such as J C Higgins, Westernfield or Revelation. It could have been made by any of a number of companies that would relabel their guns to a "store" brand, and does not appear in my cross reference lists- and single shot ,22 bolt actions are very prolific.
Not sure what brand/model you are referring to- but the most "skeletonized" 22 rifle I have seen was an all metal single shot twist barrel gun made by Garcia- the Bronco. They are $75-$150, depending on condition.
No, but, the Blue Book of Gun Values might.
Blue Book of Gun Values