I've got a stack of Blood Angels stuff on my shelf and a few things hanging on the wall, so here’s what I can say from wandering the Games Workshop aisles and ordering from their webstore. Officially, the Blood Angels symbol turns up across several product lines: the miniatures themselves (look at any Blood Angels Space Marines or Primaris box, like the various starter and 'Start Collecting' kits), the chapter-specific boxed sets (Combat Patrols and themed boxes), and the big book releases — most obviously 'Codex: Blood Angels', which is full of chapter iconography.
You’ll also find Citadel transfer sheets with Blood Angels decals, official Forge World upgrade kits and shoulder-pad packs that carry the chapter device, and merchandise like t-shirts, enamel pins, patches, mugs, posters, and art prints sold through GW’s shops and online store. Black Library releases and campaign books that focus on the chapter often use the symbol on covers and promotional art, too.
If you want to display the symbol, start with the transfers and a poster or pin — cheaper and instantly iconic. I still get a little thrill every time I peel a transfer and place that dripping, winged blood-drop on a finished shoulder pad.