Unlimited credit
From Tardis Wiki, the free Doctor Who reference
Aboard Satellite Five in the year 200,000, the Ninth Doctor used his sonic screwdriver to procure a card of unlimited credit from a Credit Five cashpoint, which he gave to Adam Mitchell as "pocket money". As a result, Adam was easily able to purchase an infospike which was priced at 10,000 credits. (TV: The Long Game)
