I have rented 2 night from someone on another site
Paid half upfront & got e-mail booking confirmation & Disney screen print download a couple of days later.
The person I booked it through has also helped me book the dining plan as an add on too.
I checked their user profile & how often they post & also paid by cheque (as only DH has paypal account & it was a surprise & I didn't want to open my own one ) - not intentionally but then I also had their home address.
I did it through the above site but it does require minimum amount of points be rented as I remember. You may find it difficult to get a member to rent to you privately for one night as well though.