What's a good budget option for dryer and diffuser for someone with fine 3a curls?

Over the last few months, I've noticed my curls aren't as springy as they used to be. I'm not sure whether that's because of my age (just turned 30 and have a few gray hairs), or because I moved to a new city with softer water, or what might be the cause. Have tried several styling products (Jessicurl, SheaMoisture, Curl Keeper) and they all seem about the same. A friend suggested that using a dryer would add volume and definition. I haven't had a hair dryer since college, so I've no idea where to start.

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