There are many ways of accessing aircraft, the first of course being renting from a club. You then have private rental, if you can find someone that is happy to hire out their aircraft when they are not using it that can be cheaper than a club, though not always, but you probably will have better availability, hire can be either straight hire or "non equity share", where you pay a lower hourly rate but pay a monthly fee as well. You then have syndicates or groups and complete ownership.
Cheapest is probably a group ownership on an LAA aircraft based on a farm strip, this will normally have good availability into the bargain.