I am always "stocked up" and never ever hoard (in my opinion). :) It seems like meats often take turns being on sale, so when I find a great deal on say, pork tenderloin (which I found 2 weeks ago) it was $5.99/pound. Not amazing, but not bad. It was buy 1, get 3 free! So yeah, I got 4 tenderloins that week. The next week, the price was good on wild cod, so I bought a few pounds. When chicken goes on sale, I'll get that too. I divide what I purchase into bags and freeze what I am not using that week, labeled, with the date on it, or cook a big batch of something and freeze it that way in meal-sized portions (meaning 4 servings/portion since we have 4 people). That, I think, is smart to do all the time. When you have a coupon for the toilet paper you use, and then you see that it's on sale, then by all means buy the toilet paper with your coupon and the sale price instead of waiting until you "need" it at a regular price! That's just how I shop, all the time.
But when anticipating a big unknown factor like a change in the job, I would start pulling the cash together a bit, and going cheap in other areas. Can you bump the thermostat up 1 degree? Plan your week out so you lump all your errands on 1 or 2 days so you aren't going back and forth to town all the time (saves gas money, reduces opportunities for impulse buys, etc). Start looking at some ground beef instead of rib eyes, don't go out to eat or out where you have to spend money as much (we do lots of stuff for fun but work it so nearly everything we do for fun is also free or very near it). Start cutting back a little bit in ways that you can see opportunities, to prepare for this possible change. You may like it and stay that way, or if you don't like it and the possible change passes by, you can go back to how you are "normally".
If this change may include moving, don't stock up. You have to pay per pound for what movers haul, and it's just more to pack/unpack. If you're just concerned the pay will be lessened, then best to just practice living more cheaply. I never buy paper products, unless you're talking toilet paper, feminine products, or typing paper. That's a waste of money even if on sale.