Rechargeable is the way to go. I recommend you spend the extra and use the low self discharge ones, especially for intermittent use. Regular ones go flat on their own very quickly. These will stay 70%+ charged after a year.
Eneloop from Sanyo were the originals but there are plenty of others now variously known as 'always ready', 'pre charged'. 'ready to use' etc.
Don't get burned - you should be able to get a pack of 4 AA's for about a fiver. I use Eneloop, Uniross and Enitime and I've not had a problem with any of them.
If you can spring for it, a good quality charger with variable charge rate and conditioning cycles is imo worth it. I use a Maha powerex. The eight way one they do may be the way to go if you need to charge several sets a day.