The phrase "a tiny sum of" is correct and usable in written English.
It can be used when referring to a small amount of money or a minimal quantity of something.
Example: "After all the expenses, I was left with a tiny sum of money that barely covered my lunch."
Alternatives: "a small amount of" or "a minimal sum of".
I realize that we're talking about a tiny sum of money, but Foot Locker's return policy is deceptive.
But at present the islanders are faced with an impossible choice: a tiny sum of money to leave everything behind, or else stay without adequate shelter.
When one of the groups is offered a recording contract with a small alternative label for a tiny sum of money, the band is widely viewed as traitors to the cause.
Just as Sinovel has refused to pay American Superconductor for services rendered, it also paid the "perp" only a tiny sum of what he was promised to get him to spill the beans and hand over the code.
Rich's response: "It's easy for other people to say: '$4 million, what a tiny sum of money.' But $4 [million] to $5 million for LACMA is not a pittance". Where, outsiders wondered, were LACMA's other trustees and their wallets?
A seemingly tiny sum of a mistake was about to cost them a fortune.
The money itself was a tiny sum, yet the act of making a small gesture of support hooked Graff on the idea of giving.
The $25 million that may be spent each year is a tiny sum compared with the hundreds of billions that Congress appropriates each year for the military and intelligence agencies.
Soon afterwards, courtesy of a tiny sum given to her by her father, she and Grigson bought a three-and-a-half room cave house at Troo, in the Loire Valley, and thanks to what she called this "troglodytic existence", her new career was born.
At the moment mortgage finance accounts for only 2% of GDP, a tiny sum even compared with, say, Mexico (9%), let alone America (85%).
The harvest of Facebook profiles began with a small personality test, fewer than 300,000 users took part for a tiny sum, and in the process millions of friends got dragged into the net.
