That's why I DIY
And believe it or not, in 2 years of running DIY, you'll buy enough sugar and yeast to pay for the entry cost into pressurized. That just on one 55g tank.
Start running multiple tanks and it is not a long time period at all.... simply because you can manifold (fancy name for a splitter) and put a needle valve at multiple tanks off of one regulator/CO2 tank setup.
Start using champagne yeast... again, time is shorter as your yeast is now more expensive.
If you count your own time as money, as I do when looking at these things, it is much, much shorter a period. I set up my 180g a year ago - that 20lb canister is still going. I've touched the setup, umm, maybe for 60 seconds every month or two to verify bubble counts. How much time and energy is in changing out that nasty smelling yeast solution every 10-14 days again?
co2-canisters.com has aggressive pricing on empty, new, aluminum tanks, and regulators. I'd hit ebay for a diffusor.
DIY is a great transition tool, meaning to find out if you want to run co2-injected tanks. It is frankly a lousy long term solution, both in cost and performance standpoints.