I would love to have a box of those cartridges for my collection, but I live in California. Because too many irresponsible shooters have caused too many forest fires and grass fires with tracer and incendiary ammunition, this ammunition has been classified under California law as a Destructive Device. Possession of a Destructive Device without a special permit is a felony, whether a tracer, hand grenade, Claymore mine, or 105mm howitzer. And we all know what happens with a felony conviction: bye-bye guns, bye-bye happiness.
When I retire in 5 years, 2 months, and 1 day and move back home to Alabama, then I can start adding some good stuff to my collection. Until that time I can only be envious of all of you who do not live in California. Of course in 5 years it may not matter. Allah's Anointed One, with Pelosi, Boxer, Feinstein, and the others, may have taken away all our guns and ammunition.