Hello and thanks everybody for your answers !
@denschub : the event is a yet-to-be-announced workshop for local associations and individuals, to share best practices about social networks and microblogging (with topics such as privacy for instance), and to promote alternatives to the main commercial services.
I will present Diaspora*. Fla’s talk at FOSDEM will probably be my main inspiration (you can suggest me other sources!). Another speaker will talk about the OStatus solutions (GNU Social, Mastodon).
To clarify : I don’t want to sell goodies! But I’m a volunteer (unpaid) who wants to spread the word about the alternatives, so I thought It could be a good idea to give stickers to the convinced attendees so they show their support too (or just remember the name of the social network they should use instead of Facebook ). It’s a bit like when you gave stickers at FOSDEM for instance. Nothing commercial.
I don’t want to spend a lot because I will pay with my own money and I will get nothing in return, apart from the satisfaction of promoting Diaspora* So I hoped for something cheaper than the unixstickers solution ($27.48 for a dozen). But I’ve never made stickers myself so perhaps I’m wrong about how much it should cost…
By the way, sorry if I’m English isn’t very good, it isn’t my native language.