I'm currently Using Dacentec for this exact reason. After the rent to own ends, you can pay $50 to have them derack it, package it & have it placed on the shipping location.. Or you can pay $30/Mo for 1 U colo.
Dell server can be cheap if you have a good source to purchase it.
Maybe after 2 years, the Purchase fee + Colocation fee already break even or is even cheaper than renting the same server for 2 years.
Again, it works better if your server is high end.
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