Somehow I don't think there will be any bargains. Back in the day I tried to be a customer of Vale-Onslow's. They had a shop in Soho Road Handsworth, Birmingham not far from the Municipal Library, and a lock up store/bike breakers at the top of Dawson Road. I say tried, because even in 1964 they would ask top dollar for the most mediocre of Lambretta LD bits. Instead I went to Aston Autos, now long demolished for the Aston Expressway, where the parts man I reckon was Ben Croft, he of later C&D Autos, Acocks Green and now that business still survives out in the country not far from GB. I bought stuff from C&D in the 1970's when he also still had the genuine parts from when BSA closed, and he was a real rough diamond but a fair bloke.
In those days "Onslow's" was run by Len Vale-Onslow, a true character whose achievements are well documented. They also had a shop in Sparkbrook, and moved to indusrial premises in Bordesley Green a few years ago.
It was rumoured even all those years ago that the Sparkbrook premises were piled high with genuine BSA spares. Now I just can't understand how some traders work their magic, but Onslows now also offer stuff on eBay, and again the pricing policy remains eye watering. I suppose they know what they are doing, no-one knows what the future holds, before all that stuff becomes redundant over time.
No doubt Chris Williams' Autocycle have already knocked on the door. Another well establisher operator who knows the market but is too pricey even on eBay for the likes of mugs like me.
Swarfy.