Most shopping channel, department store telescopes, etc
Telescopes found in closeout type catalogs
At least 90%-95% of telescopes on ebay
Category 2: Recommended With Reservations ($300-$600)
Meade DS/EC Series
Bushnell Voyager Dobsonians
Old Coulters with blue tubes
Old 1980s vintage Celestrons with the word Comet in them
Celestron C150HD, G8N and NexStar 114 hybrid Newtonians (2+)
Celestron NexStar 114GT (Hybrid, 2+)
Edmund Astroscan
Category 3: Recommended ($250-$1500)
Most Celestrons
Meade Starfinders (watch out for #77 2 plastic focuser)
Most older Meades, 6 and larger (#628, #645, #826, #6600, #8800, etc) (3+)
Meade 4500 (Avoid similar versions with .965 eyepieces)
Most old Edmunds (red-tubed models preferable to white-tubed ones)
Old Criterion Dynascopes (6, 8, check to see that RA drive works)
Orion XT and Sky View Deluxe models
Older Orion Dobs (DSE, etc)
Discovery
Coulter/Odyssey/Murnaghan scopes with red tubes (3-)
Old Junos (3+)
Stargazer Steve (kit)
Orion (UK) (3+) (unavailable in US)
Category 4: Highly Recommended ($500-$3000)
DGM (4+)
Parks
Most old Cave Astrolas
Old Meade Research Grade Reflectors (8, 10, 12.5) (4+)
Tectron
Sky Designs
Old Starliners
Sovietski
TAL
Most Vixens