Best way to get Sprint phone DS Unlocked?

I guess the only way is to get on the Sprint 5 lines for $90 for 50 days then request unlock. So probably costing $200+/- to DS Unlock 5 phones.

Any cheaper ways?

Depends on the model and the status of the device(s) (e.g., blacklisted, financed, under contract, paid in full etc.).

No longer under contract, guess owner skipped the bill. S6, so it's under the new rule where Sprint supposedly will automatically DSU the phone once eligible. Waiting for confirmation from Ting.