TBH, You might want to look at buying a mill.
Part of the idea with (bulk) buying whole grain is that you can crack it whenever you're going to brew. So it's cracked fresh. Once cracked, the grain might be good for a month or 2, but I'd want to be using it with a fortnight, if not a few days. OTOH, whole grain can keep for at least a year, general 2 in my experience (longer for spec malts).
When I say "keep" or fresh, I'm referring to both flavour but also the diastatic (enzyme) power of the malt.
It means another ~$100-150 up front as part of your Bulk Buy expense. But if you save, say, $30-70 on cheaper grain, then you're only spending $50-80 on a piece of gear that'll last for years, and enable you to buy (cheaper) whole grain from now on. Bargains!!
... and down the rabbit hole you tumble ... [emoji1]