There is a big number of possible combinations between hardware and software to help you mapping. Most people may have useful equipment without even knowing! You will see, it's not expensive to be a "pro mapper". I got all my GPS/Tracking/audio/photo equipment for a total of $120 on ebay. On top of this, it features a MP3 Player, radio, phone, internet browser, pocket lamp, alarm clock... :)

I've just compiled a list, which may also be used as a OSM shopping guide. It's located right here in the wiki. It definitely needs some spelling corrections, I'm not a native english speaker. When some of the chapters expand over time, it might be needed to exclude them into own articles, like this very exhaustive GPS Reviews list.

To make this complete, I'd like to point you to the list of tracking software in the wiki.

There are tons of other useful information in the wiki, have a closer look if you didn't already!