Spotify Premium Duo allows two people to live at the same address to share a plan. But Android users have a trick: Spotify Family (6 accounts for $16.99). If you have five friends, each pays ~$2.80.
You can buy digital Spotify Premium codes from sites like Eneba or G2A. For $3–$5, you get a 1-2 month code. This is effectively a "legal generator" where you exchange cash for a key. No scam, no malware.