A Subaru dealer's parts counter will often supply a Cambelt Kit with Water pump and Thermostat pretty promptly if you don't want to wait. Pretty on par with Partsouq's individual pricing. Amayama is cheaper but you have to wait longer.    Water pumps can have up to 3 extra ports depending on application so you might want an idea of how many yours has if you are buying that part individually. 

Not so much a kit but if you bought all the bits from Amayama it would likely be much cheaper and all genuine parts. You just have to know what you're shopping for.

Kia ora. I'm going to replace the cambelt etc. on my old 2.0 NA DOHC BP5. I want a kit that includes a water pump. Any tips on the best place to get a decent kit gratefully accepted. Thanks!

As far as TCU tuning you’re probably limited to CCT as I’m not sure any of the others will get into that side of things.  Tony and Dave at DTech are legends and unbelievably helpful with dumb questions and support so they always get my vote but not sure they will do TCU stuff

+1 for SAS    https://www.facebook.com/share/1BmSrbYsZj/?mibextid=wwXIfr