Medtech has a variety of colon tube, bags, nozzles, and other stuff. Browse their catalog.
AFAIK, there are now very few, if any, alternatives to the Coloclean. There used to be something similar, the Miracle Enema by the makers of the P*I*E trolley system, but far less expensive. It is now discontinued as fa as I know.
Either of these systems is petty difficult to use w/o a helper, because the water and poo bags have to be taken to the bathroom refilled and emptied respectively after the first or second fill/poo cycle, and if you are solo, the speculum has to be removed to do this.
If you are fortunate enough to have help, putting in a Foley hooked to a bed bag eliminates the need to pee during the session, and it is very likely you'll absorb more than you bladder can comfortably hold during a session. Using a urinal is not an option… The inflated retention balloon in you rectum makes it all but impossible to pee.
With a willing helper and the Foley, you can have a VERY relaxing and cleansing session lasting several hours.