Also used to buy in late 60's / early 70's from Ray Avery's in Calif (didn't his shop get destroyed in the 71 earthquake ?) -- thou a branch exsisted after that, I believe it was in new premises. Before Avery's, used to buy from Randy's Record Store in Gallatin, Tn (they sent out catalogues). Also bought (mail order) from big cut-out warehouse somewhere in the NY / NJ area (gave all their lists -- sent out monthly) to Snowy way back in the mid 70's. The warehouse list went from 10c per 45 to 50c per 45 .... with tea-chests full of 45's on offer at about 1c per 45 (but the chests contained 100's & you didn't know what you were getting).
In the 80's, used to go down to Telford to Oldies Unlimited and get 'locked in' the old chapel where they kept all the old stock of import 45's ..... would be let out at the end of the day with piles of 45's & haggle with owner over how much we had to pay (a few pence per 45 it was but he was always trying to push up the costs as we had 'picked em' ourselves). Prior to that, around 1968/69/70, would go down on train to Leighton Buzzard to F L Moores (when he was still in the old house) & dive thru all his piles of soul 45's ...then up to Wheel to sell some for 2/3 times what we'd paid a few hours earlier. GREAT DAYS !!