Need Futon or Daybed w/ Trundle STJ/STT

Greetings all,
We're in need of a decent condition/ gently used daybed (preferably with pop-up trundle), or futon frames.
IF good / clean condition may also consider the twin mattresses for day.
Would appreciate any tips on best place (don't want to break the bank) to purchase new in STJ or STT as well.
Look forward to hearing from you if you have now or may have something in the near future.
Thanks very much & have an awesome weekend all.:-)
Lee-ah