Sorry, but the local stores are worthless here. Double the price (already!) sometimes. Guy i know at one who used to work on my type of truck loathes the store even and sends me elsewhere.
Flood of chinese trash at it. Inability to stock basics like liquid electrical tape, but can have three rows on the same shelf for overpriced powering steering fluid? Give me a break. They, not those flocking to online (who have to do it in the first place because of practices like the above) are the problem.
I've seen this disease at all stores. It took a act of congress to get liquid electrical tape. Finally found it at autozone. Pep boys, checker (now o'reillys),walmart, lowes/home depot, used to stock it, but not anymore. Again, it's "easier" to stock three rows of the same product (atf,oil,etc etc) then it is to knock off a row of oil and put that product in.
Don't even get me started when I see a empty non tagged spot on a shelf at these places...
I think any storage would be fine as long as they're not exposed to sun/ozone. I think the garage should be fine I'd think unless it's for 20 years or something.
Always worth keeping in mind too that taking buisness away from the local store means eventually they'll go out or have to raise prices a ton..... everything's a trade off. Just food for thought.