Get a trial membership at either Connections123.com or SimpleEscapes.com. Both are run by the same company. If you join through one of the rewards programs, a trial membership will cost you $1 for a processing fee. The membership is good for 30 days but you'll need to order your vouchers during that time period and cancel your membership soon after getting the vouchers or else you'll have to pay the yearly membership fee ($139.95 at Connections!).
They deliver quickly and with relatively few problems. The vouchers do have expiration dates, so you will need to time when you join with the current expiration dates. Right now, the vouchers that they are sending out will expire on May 31, 2003. If you are traveling this summer, you'll need to wait on joining.
I joined last year and had no problems canceling my membership, They did keep me on the phone for a very long time, and repeatedly offered lower rates for their program. It's a hard-sell but if you just keep saying NO they will eventually stop.