As suggested by Jesus in one of his Status updates on the Forums

Original values of unusuals used and overpay applied when necessary. Buds and keys what they were time of sale

Proof #1

http://www.tf2outpost.com/trade/16276091

Sold for an SF Bat (~18)

Total: ~18 keys

Proof #2

http://www.tf2outpost.com/trade/16678301

Sold for 17 keys + Genuine Balloonicorn (~2) and a craft hat

Total: ~19 keys

Currently on Outpost: 7

http://www.tf2outpost.com/search/183577733

No Buyouts effect this suggestion's price

Conclusion

Finally, a simple suggestion that wasn't at all hard to make. 2 simple sales, one simple range. Thank you, Jesus (the user, not the religious icon) for pointing out this needed a price. I hope I did it to your liking. Any Extra Proof/Cunter-Proof/Opinions/Tips/Help is all welcome. Thanks for reading. Feedback is always appreciated.