Don has pointed out in the past, and I agree, that by not having the "bulk" plastic stand in this case, these things would never be put back where they were intended to be displayed by the guest and often times would not be replaced by housekeeping.

There is a great way to get the ads printed by professional photo labs for about 20 cents per side that will give them a professional look and can be inserted into the stands.

Simple and easy.
upload graphic,
send to printer,
pick up 200-300 professional photo lab prints in about an hour for 20 cents per side.
place in stands and deliver to hotel.
Jason

Cheap and easy service.
(yes woody, I understand that vendors are used in the daily ops of most businesses)