New air rifles, pistols - Webley or BSA usually - from the local ironmongers. Never bought a new one then, but can remember buying William Rogers bowie & other knives in my school uniform. Pellets from there, or the local fishing/cycle/model shop. Beatall(?) were a cheap option. Marksman if I was a bit more flush, Webleys were a birthday/xmas treat. Secondhand guns from any number of backstreet 'junkshops', who weren't to particular about age - was it 15 then?.