Hi Rod,
There's a Revell 1/144 scale kit of the Shuttle with tank and boosters on the launch pad/crawler. The Orbiter is the old (late 70's?) vintage Shuttle orbiter with the ESA Spacelab in the cargo bay. The boosters and tank are a later addition (early/mid 80's I believe). This kit is currently available and is listed in the RoG catalogue. I believe this was at one time offered with the whole launch tower complex - this is not currently available
There was another similar kit by Airfix, which also had the boosters and tank. This kit has the ESA Spacelab module moulded integrally with the cargo bay. I'm not sure of the current availability of this kit though.
(I built the Revell orbiter kit and Airfix "stack" many years ago when they first came out, and I'm just going from memory here)
Arguably, the Airfix Orbiter had sharper detail, but I understand the boosters/tank on the Revell kit were better.
Trivia note: Airfix also released this kit in the markings of the "shuttles" appearing in the James Bond movie "Moonraker". (This movie was released in 1979, so both the original Revell Orbiter kit and the Airfix "stack" kit pre-date this)
Monogram produced the Orbiter/Tank/Booster stack in 1/72. I'm not sure of availability of this one either.
Tamiya make the Shuttle Orbiter on its own in 1/100.
Academy make the "full stack" in 1/288 - I don't know anything about the quality of this kit though.
Turning to the Saturn V, I suspect you were looking at the Revell 1/96 scale offering, which is quite big. In 1/144, this has been offered by Airfix and Monogram. Each has it's particular quirks, and both date back to the 70's. Airfix is scheduled to reissue an upgraded version of it's offering this year, so stand by.