Regnest offers backorder service upon request of the customer. You have high possibilities of grabbing an expired domain that has entered Pending Delete Period with us.
If the owner does not renew the domain, it goes into the process of pending deletion period. For the set of time, the current owner will still have a chance to renew the domain.
Placing a backorder on a domain only happens when there is a drop date for when it can re-enter the registration pool. Announcement for the time it will take in between when the drop date and when the domain becomes available for registration can vary, as it depends on the specific TLD. Once the Pending Delete period is over the domain becomes available to register.