Amazon is the best place to get them. I got all of these on Amazon, and more.

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Your nearest Catholic church

Walmart

At the butcher's shop.

I usually just use stuff around the house but can never find anything long enough

You say you live in the USA but you don't say where. Here in San Francisco sex toys are so mainstream that there are dozens of shops that sell dildos. If someone wants one, he just goes down to his friendly neighborhood dildo store and buys one. I realize that might not be the case in other parts of the country. But that's what the internet is for. Unfortunately an internet shopper cannot see and touch the merchandise before purchase, let alone try it out for size. But trying out a dildo for size is not even allowed in a brick and mortar dildo shop.

Even Amazon sells them