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You can check "buy for free" and you can check to buy at a "custom cost".
The free option means what it implies.
The custom cost, means you pay whatever you want to pay.
If you take the cost for 40 arrows and divide by 40, you get the cost per arrow.
Then multiply that by however many arrows you want to buy.
Pay the amount, for all 40 arrows, that you wanted to buy the lesser quantity of arrows for (normal cost for say 3 arrows).
Then sell the rest.
When you're selling, the default price you get is 0%, but you can click 50% and 100%.
So if you bought 40 arrows (worth 1gp each) and only wanted 5 arrows (so paid a custom price of 5gp), then you could sell the remaining 35 for 0% sale price and end up with 5 arrows at 5gp total.
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