Ok, so I buy one fairly spendy new pillow at a time. The replaced goes to my husband (claims he doesn't care, it's my money). Then the oldest two become the underpillows if suitable.
Anyway, if been going with pocket sprung pillows last couple of times (unparralelled bounce-back, but when they do go, they're lumpy). This time I bought a "side sleeper" pillow - instead of a pouch stuffed with pillow stuff and sewed on four edges, it is a three-dimensional fabric shape, then stuffed. Instead of coming to an edge, it has "walls". Honest to Jarvis! Early days but I'm very pleased.