Depends of you $ situation. Me I'm going to have to reload. Around these parts of GA; Cor*bon goes for $32-$40 a box of 20. I have seen only one place that carries Hornady Custom .454 and its was $28 a box/20. The least inexpensive that I have found is the Winchester 250grn HP at $20 to $22 a box/20.
The cheaper alternative, if possible is to shoot .45LC; that is what I have been doing since I bought my SRH. However, that dirties the forward part of the cylinder. Very soon, I will have enough .454 brass to reload my own, that looks like the only alternative for practice ammo in .454. BTW, starline is the least expensive new brass i haev seen so far at $20 to $28 for 100 unprimed brass. Winchester brass, I believed primed is going locally for $40 per 100.
If you find a good inexpensive place to find factory ammo, let the rest of us in on the info. Happy Hunting.
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Know Yourself, Know Your Weapon, Know Your Enemy; then Know Victory! ---DaHaMac