A Quick way (Not always the best way) - Credit Card.
Depends how quickly your going to turn the 5k/10k around, If you use it wisely and can turn the profit before the '0% on purchases' offer runs out use their money to purchase the stock, repay the stock cost from the card, keep the profit.
But . . .
If you cant repay by the time the '0% on purchases' runs out you will then be charged the interest, which on 5k/10k could be a fair amount.
Its an option, but not always the best one
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E-ASYCHOICE
In business for profit, not just to shift boxes 