I have many different costumes as a creative way to get someone to tickle my belly. The first time I did was on Halloween, when I dressed as a belly-dancer and went to a party. I was cold outside and when the cold air hit my stomach, it made me feel ticklish before I even got inside the party house. The men inside stared at my stomach all night and that made my skin "crawl" with ticklish feelings. I finally met a nice guy who drove me home and gave me a nice "good-night kiss" on my belly. That kiss caused my belly to move and "flutter" right in front of his face, so he thought I was doing a belly dance for him.
If there's no one available to tickle your belly, I've found that wearing a bare midriff outfit and stretching out on the floor starts a "ticklish" feeling to begin. Then I take an ostrich feather duster and drag it up and down my belly. The nerve endings come right up to the surface and "tingle". Creates a nice "self-tickle" sensation. Try it sometime!