And for the pricing.

Unused N900.

I have just bought two used ones, one with 25€ with charger and one 45€ with the box and everything. But you could get 100-150€ if you wait until leste is up and running well and in your selling post you would put links to guides how to install Kali Linux, install Pawn Express, install leste jne. The more you show and tell people what they can do with something which they can't use on many things the most basic low price smartphones can nowadays, there's your marketing.