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If you need an additional 50 GB of storage space temporarily, one of the cheapest ways to achieve this is by using a cloud storage service with a free trial or a low-cost subscription plan. Here are a few options:

1. Google Drive: Google offers 15 GB of free storage, but you can upgrade to Google One for 100 GB at $1.99 per month. You can cancel anytime after you no longer need the extra storage.

2. Microsoft OneDrive: Microsoft provides 5 GB of free storage. You can get 100 GB of additional storage for $1.99 per month. Again, you can cancel once you no longer need the storage.

3. Apple iCloud: If you're an Apple user, you can get 50 GB of iCloud storage for $0.99 per month.

4. Dropbox: Dropbox offers 2 GB of free storage, but you can upgrade to their Plus plan for 2 TB of storage at $9.99 per month, billed annually. While this is more than you need, Dropbox sometimes offers free trials that you could take advantage of.

5. Mega: Mega offers 20 GB of free storage, and they occasionally offer temporary bonus storage. You can upgrade to 400 GB for around $4.99 per month, which is more than you need but still relatively cheap.

If you only need the storage for a very short period, using a service with a free trial (like Dropbox's trial period for their Plus plan) could be the most cost-effective solution. Just remember to cancel the subscription before the trial period ends to avoid being charged.