Can you store bulk bought dried spices in plastic sandwich bags in a large plastic container in a cool, dark corner?

Dried herbs lose their potency quite quickly - maybe 12 months or so. So unless you use the much larger quantities, or are happy to throw much of them away (as they were so cheap), I wouldnt have bought them. I have the same issue buying dried items from the Middle Eastern or South Asian shops - but I'm happy to throw them away when they've reached their "best before", even If I havent used too much of the bag (knowing I've saved a small amount of money and helped a local trader). They happily live in the cupboard on the same shelf as my small jars of supermarket bought herbs.

Dried herbs don't last long, less than a year. Ground spices are good for a year or two, and whole spices/seeds are good for three to four years.

Air is the enemy, more than light, so vacuum pack any spares.

You can leave them in sandwich bags in a cool dark place, but as others have noted, it is hard to use very large quantities of herbs and spices before they lose their potency. I tend to buy dried herbs and spices in small containers for that very reason. I do not know where you live, but here in Austin I have found I can buy most spices in very small quantities at HEB. They have spices in their bulk goods section. I have also found that for those spices I use more of, like cinnamon, cumin, and various dried chiles, Fiesta Brand is way cheaper than the brands like Spice Islands or McCormick and every bit as good, sometimes better (love their dried anchos, cascavels, and arbols). I also like to grow things that are easy to grow and do well here (rosemary, Mexican oregano, bay, various chives, thyme, cilantro, parsley, basil, and Mexican mint marigold (a great substitute for tarragon which does not do well in our hot weather)). If you have a dripping outdoor faucet or regular drips from an air conditioner or if you live in a very rainy place, you can also grow spearmint in the moist soil. Fresh herbs lack the intensity of dried herbs but offer some nifty flavors. The lowly steamed new potato is a treat with good butter and fresh parsley. Lastly, grocery store spice selections have gotten better, but you can almost always get a bigger selection at an Indian grocer.

I wouldn't put those in the fridge nor freezer. I use Killner clip top jars to store my dried spices in.

I appreciate you getting a good deal and all, but as you live in a hot climate why not grow these Mediterranean herbs yourself so you can use them fresh?

it's unlikely you will get through all that by cooking for one before they lose their oomph. do you have anyone to share them with? otherwise it's a waste of money just tossing them.

i keep all that stuff in the freezer, with a small amount in the cupboard.

the humidity may not be super conducive to grow lots of herbs that thrive in dry climates but i'd for sure give it a go.