I love e-plus on Interval International. Here are the rules...I copied this from tug. Please note that this is a rather inexpensive way to extend a week also.
7. (a) For Members who wish to change their Host Accommodations
subsequent to receiving a Confirmation, but without canceling their
Confirmation, E-Plus is available to allow Individual Members to
“retrade” their original Confirmation, up to a total of three times for
different Host Accommodations and/or alternative vacation periods,
upon the payment of an additional fee. The use of E-Plus may be
purchased at any time commencing at the time an exchange request
is initially placed and continuing up to five (5) days following the
issuance of a Confirmation, so long as the purchase is prior to the
first date of occupancy of the Host Accommodations and the Host
Resort is in good standing with II. E-Plus may be used to secure up
to three (3) retrades of the Member’s Host Accommodations and/or
vacation periods, at any time up to 12 months after the first date of
occupancy of the Host Accommodations of the original Confirmation
(the “E-Plus Usage Window”). Once established, the E-Plus Usage
Window does not change upon any subsequent retrade.
(b) When transacting an E-Plus retrade, the member may view available
Host Accommodations and a Confirmation will be instantly issued if
the desired accommodations are available at the time the retrade is
initiated. Retrade requests may be made by online or by telephone.
6(c) (i) When the Member transacts an E-Plus retrade 60 days or more
from the first date of occupancy of the Confirmation or, if applicable,
previously issued retrade, he or she will be entitled to select
available accommodations with travel dates any time up to the
expiration of the E-Plus Usage Window.
(ii) When the Member requests an E-Plus retrade 59 days to 24 hours
prior to the first date of occupancy of the Confirmation or, if applicable,
initial retrade, the Member may only select from accommodations
that have occupancy dates commencing up to 60 days after the first
date of occupancy of the Confirmation or previously issued retrade.
Any subsequent retrade request may only be for Host Accommodations
with occupancy dates 60 days or less prior to the first date of
occupancy of the current retrade.
