Make a list of bonus types you don't have boosting your saves.
Now check out the Creating Magic Items table in the SRD and realize that "Save Bonus (Other)[2]" is a thing that references to the bottom of the table where [2] is explained as "Such as luck, insight, sacred or profane bonus." and that "Such as" does not limit the list of alternate bonus types you can craft a Save boosting item with to just those 4 called out on the table.
The solution is spend more money.
If you run out, Untyped bonuses always stack~
You can totally add the alternate save bonuses into an item already taking up one of your body slots that is likely boosting your saves already and potentially slightly discount it per the "Adding multiple similar abilities" stuff for magic items with multiple effects.
I only say it specifically because you mentioned you're entering Epic levels soon and thus should be drowning in disposable income
Worst comes to worst, venture into the abomination that is creating your own Epic Spells to solve your Save problem