Trial Prints

Three or four years ago I used to print quite a few A3 prints. As they were for sale everything needed to be 'perfect'.  For this reason I made the decision to only use genuine Canon inks and paper - but this made the prints a little expensive.
I no longer do that kind of printing but my A3 printer needs new inks.
Eight genuine cartridges will cost me £120....is it worth it for the number of prints I do?
I have a need for four A3 prints by next week so I decided to ask Dandy Arthouse to print them for me (they print my cards and have always been TOP quality).  I collected them today and I am very pleased with them.
Decisions will have to be made......