Answer 1: snail mail. $1.15 and you're done. Of course, it takes some time.
Answer 2: Depends:
1) From where, to where?
2) Changing currency? Which ones?
3) How fast?
4) How much, specifically?
5) When you say cash pickup, are you implying without some kind of bank account? What about other digital marketplaces?
In Europe, I can send money to any IBAN account in euros for free, available from instantly to 1-2 days. No need for venmo or anything else--it's already built in. Thinking from the US, Paypal is available quite extensively. Any other answer depends a lot on your parameters, as there is no universally-best service.