@erevu, he's already said he flat out can't afford premium.
@PamperDude, I've never tried them before, but when I worked as a CNA the residents used Attends. I couldn't tell you firsthand how they feel as I could not use them, but they seemed like they could last for a little while. Don't take my word for it though, look up reviews and see what people say about it who have actually tried it. See if the brand offers samples on their website that you can try out before you commit to using the particular brand. Also, make sure you're wearing the diaper right (I know that should go without saying, but it personally took me a little while to figure that out). I've never done it myself, but I've also read of others who use booster pads in their diaper (I don't have any words of wisdom on that though, so consider it a suggestion you can try out). But finally, always, always, always make sure your diet is does not consist of too much acid. Your body filters it out for you, but since you're essentially going to be wearing what passes out you'll either have to change frequently or sit in it, which, again, will give you a rash. I personally wear leisurely and take breaks from wearing since improper care leads to worse health problems down the road.
Loose is also bad. The diaper should fit snug as looseness will give you leaks. Packaging will usually include a range of sizes that it can be used for (measured in inches, same as your pants, nondisposable underwear, shorts, and whatever else you wear around your waist). Leaks will make you smell bad. Even if you grow accustomed to the smell, others can still smell it and will avoid you, so watch your hygiene as you transition.