I often nip into charity shops to see if they've any good quality toys for me to keep at ours for when the DGC descend on us. And I go to a twice yearly car boot sale at our local primary school for the same reason. I've staggered home with some good bargains from the boot sale - a Fisher Price garage much better than the ones on sale now, a huge box of Duplo, lovely books, a pirate ship complete with crew and cannons. Not so much from the charity shops, but I did once find a couple of new boxes of Playmobil and, on another occasion, a second pirate ship (so they can have battles!). I sometimes think I've more toys here than I ever had when our DC were growing up
When DD2 was getting married, I was charged with finding 120 mismatched china cups and saucers for the reception. I haunted all the local charity shops and boot sales for weeks and eventually managed it. The boot sales were by far the best place for this - I once got on the bus with a full 12 piece tea set, plates and all, which I think I paid about £6 for. I never bargain - I'm way too English for that We shipped them all off to the local hospice shop last month and apparently they flew off the shelves.