From my experience, the best thing is to do look out for some levels yourself. This is what I've always had to do whenever I ask for levels. I haven't played many custom SP packs myself and many of the ones I do are coop unsuitable (it's not just to do with bosses, it's stuff like collapsing scenery or big boxes with death pits below them).

Try this link for all the SP packs/levels on J2O: http://www.jazz2online.com/downloads...sc&filerating=

You should probably play them first to see if they work in coop though.

If you don't have a whole lot of levels (which seems so since the CTF server only had the default levels), the original SP maps are easily understood by name. You can search them in JCS by clicking "File" then "Open", and finding your jazz2 folder. They have generic names like castle1 and hell1...etc.