As a buyer I have no idea (unless there is a way to see this now, as a buyer..). So I kind of have to assume that everything fulfilled by Amazon is.
I also misunderstood what you said, I thought you meant buying sold and shipped from Amazon avoided commingled inventory. You actually said the opposite.
As a seller I can tell if an item is allowed to be commingled if I add it to my inventory. You can't tell before you add it to your inventory as far as I know. Buyer has no idea. It seems random for what they forbid to commingle. Like one particular hard drive but not others.
If you buy from a third party seller you have no idea if they opted into commingled inventory or not.
It's killer for me and my family. Everything we get online instead of going to a store means one fewer trip out in traffic either 1) with the kids or 2) at night after they've gone to bed but we're tired.
I guess I see it this way: If I buy a whisk, or a hard drive, or a vacuum cleaner, or a video game I don't need it this second, I take the free or saver shipping and I get it when it comes, which is 2-4 days 99% of the time. Like the old fashion "put it on the shopping list" method. There's no urgency in me to get it in two days.
The non-perishables like toilet paper, paper towels, shampoo, etc. I stock up on when they go on sale so I don't generally run out so there's rarely urgency. But paying attention to your stock accomplishes the same thing.
The few times I've needed something earlier, like when my phone broke and I ordered a new phone, I paid $6 to upgrade to two day shipping. That's the one case I can think of when I could wait two days but not four.
The typical Prime buyer basically never comparison shops or wait for sales. It encourages this behavior.
I get people have different proprieties than me though even though I can't personally understand it. When my brother moved into his own place he bought a bunch home type stuff and ordered it all off Amazon because "Prime." Later on I mentioned something about comparison shopping and he told me he didn't even think to comparison shop for any of that stuff. He was like "oh... I should have done that" (On a related note, ordering directly from the manufacturer on some of that sort of stuff gets you the best prices)
Then, for packages I don't need right away (which is a lot of them), I can pick "no rush shipping", which typically gives me a $1 Amazon Digital credit. Stack up a few of those per month and Prime becomes almost free. (We rent movies occasionally from Amazon.)
Then, extend Prime by a month everytime Amazon misses a guaranteed delivery date and Prime has basically no net cost to me. I was already ordering from Amazon multiple times per week before Prime was created. I'm sure Prime has increased that somewhat, but I still cross-shop Ebay, BestBuy, and others as well as checking camelcamelcamel.com on anything of non-trivial cost.
My big pet peeve are add-on items. I don't understand why they don't just give me the option to pay for shipping. I don't mind paying $10 shipping on a $1 item. It's still cheaper than driving to a store.
Edit: Just tried it, didn't work. Khaaaaaaaaaan!
I agree and when I order never concern myself with prime shipping. However I do find a slight distaste anytime I receive shipping information to find it won't be here for 3+ days. I'm not sure why but something about immediate item receipt is rewarding and waiting for more than a few days I am less excited about receiving said package.
Well, speaking as a Amazon seller, this isn't quite true. Commingling is optional for third party sellers (and unavailable on some products). Also your third party sellers items get commingled with Amazon inventory so buying "sold and shipped by Amazon" doesn't prevent you from getting a commingled product.
>..But hey 2 day shipping for $8/ month right!
Free shipping is prepaid shipping and encourages you to buy a ton of crap to "get your money's worth."
Honestly, personally, I don't understand the appeal of getting my stuff in 2 days vs say 4days or whatever. If it was an immediate need I'd either buy locally or pay the upgraded shipping when I need it. That's just me though