Free Google Home Mini, worth $49, resell value ~$32
Spotify is doing a promotion for Family Plan accounts to get a free Google Home Mini
UNITED STATES PREMIUM FAMILY OWNER ACCOUNTS ONLY,
Promotion ends 12/31/18 but this promotion is a "WHILE SUPPLIES LAST" promotion so it can end any time
All orders are also currently on back order. So, as of 11/9/18, estimated delivery is Dec 5 - 7

1. Go to Spotify website
2. Sign up for a new account
3. Sign up for 30 day free trial (individual plan)

3a. Signing up for a free trial requires inputting a debit or credit card number (including zip code), or linking paypal. Pre paid cards from walmart and/or VCC do indeed work. PayPal will charge 1 cents, cards will be $1 Pre-Auth although some of my cards with $0 balance have worked

4. Go to the manage plan section, click "change plan", and press "add family". This will change your 30 day free trial individual plan to a 20 day family plan free trial (no you will not be charged for changing to family).

5. Go to "www . spotify . com / family" and press "get your google home mini"

6. You should now be on a page that says you have successfully reserved your Mini. The link for the mini will be in the email you used. Or, you can just type "www . spotify . com / us / googlehome / redeem" and you will be redirected to the Google Store
7. Checkout with your information. Google checkout will also require inputting a card number even though it is free
8. Cancel your spotify subscription so that you dont forget and get charged in 20 days

In order to abuse this, you can either keep making accounts and finding payment methods (card or paypal) or find cracked accounts on the interwebz and sign in and then hope that they havent redeemed their mini yet.
As far as shipping multiple to your house, should you use a drop, is there a limit, will they cancel, blah blah blah.. I dont know. I've ordered 70, have had no cancels, but none have shipped either.

Get a bunch and sell them on eBay. You can drop ship them as google lets you change address on order even after the initial order placement as long as it hasnt shipped yet (which it wont for at least like 8-9 days, maybe even 2-3 weeks)