Your biggest supplier of pre-owned games will be your customers.
Another thing to consider is your selling prices. You won't need to sell your Games/DVDs/Blu Rays etc at Internet prices.
All the major Game Distributors/Suppliers all sell (new) titles at roughly the same prices in my experience so its as much about finding a supplier that suits your needs rather than chasing the cheapest supplier.
Also back on topic. I decided a month or so back to walk away from the Grant/Loan as no one could decide on terms. I think that a loan/share option would be too time consuming to manage for the amount of return (we would be looking at a few % each) and the grant idea was rejected by all interested parties.
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Make Money Selling Video Games; Gamefox.co.uk A New On Line Trade Mag - Free Business Document Sharing Site TotalDocs.Net