It is easier to link to the DSF site which has samples of the sounds
https://www.digitalsoundfactory.com/jupiter-8-0
https://www.digitalsoundfactory.com/mellotron-0
The links in the CW store are in Specials or http://www.cakewalk.com/summer-sale  bottom right "100 downloads under $20." Use the search option in the upper right to filter for "Jupiter" or "Mellotron"

As an aside, if you really want a Jupiter 8 check out Arturia's offering: http://www.arturia.com/products/analog-classics/jupiter8-v . I had a Jupiter back in the day and this is really close to the real thing. Of course it's much pricier that the DSF option.

DSF also has a Soundfont Jupiter-8 for $9.95. Play it with e.g, Sforzando (or sfz, Dimension, Rapture)
http://www.digitalsoundfactory.com/jupiter-8
 
Mellotron in Soundfont too ... but it's $29.95

DRanck
As an aside, if you really want a Jupiter 8 check out Arturia's offering: http://www.arturia.com/products/analog-classics/jupiter8-v . I had a Jupiter back in the day and this is really close to the real thing. Of course it's much pricier that the DSF option.

Still a fair amount cheaper than the $4,500 the real thing set me back in the 80's, though. It was my main instrument for about 7 or 8 years. It was a beast, weighing in at over 70 lbs in the Anvil case. But it had so many blinking lights that it was its own little light show.
 
I sold it for $1k, thinking I was dumping it just in time before it lost all value. Silly me, it'd still be worth that much now, a quarter-century later. Same for the Juno-60, Micromoog and Roland drum machines I'd also assumed would soon be obsolete and unloaded around the same time - $800 for the lot.

bitflipper
I sold it for $1k, thinking I was dumping it just in time before it lost all value. Silly me, it'd still be worth that much now, a quarter-century later. Same for the Juno-60, Micromoog and Roland drum machines I'd also assumed would soon be obsolete and unloaded around the same time - $800 for the lot.

If only we'd had that crystal ball bit...
 
I sold my Juno 6, TR-606 (Drumatix), TB-303 (Bass Line) and SH-101 (needed the money for something else...) for less than half of what I paid for them 

If I knew what my gear would be worth today, I wouldn't have sold it back then. But who knew?