any of the non vivid color metered one ISO lower than marked will reduce saturation. The 800 ISO films tend to work best for this. Some filtration also will reduce saturation. Otherwise, finding a lot of not too expired, expired film will do the trick but w/out the predictability of film within date, especially if metering one ISO lower than marked. If you're just experimenting, 2 years expired and stored properly is within reason.
your lens will also factor in - older lenses tend to wash out more than a double coated lenses - for example the t* hassy lenses will give you more saturation with contemporary color film and a 70 year old zeiss lens will give you less...
I have some 10 year expired Portra 160 that I may run a roll this weekend - just to see. If I do I'll post results in this thread.
I've recently tried the Rollei digibase 120 film, rated at 200, shot at 125 for negative density. It wasn't as saturated as the Kodak and Fuji films, but the price point is high (close 10 10 USD a roll).
As far as paper is concerned, I believe that Fuji is that last standing papers available. I recommend the Fuji Crystal Archive Super C- matte (stay away from glossy). Relative to B&W, it's cheap @ 20 cents USD per sheet at 8x10... packaged in boxes of 100.
Good luck, it will be fun seeing your results.