The phrase "a sizable amount on" is correct and usable in written English.
It can be used when referring to a significant quantity or value related to a specific subject or context.
Example: "The company invested a sizable amount on marketing to boost its brand visibility."
Alternatives: "a substantial amount on" or "a considerable amount on".
I've had to spend a sizable amount on outside legal counsel".
The High Cost of Scheduling Pete Sampras has won more than $41 million in prize money during his legendary career, but he has also left a sizable amount on the table in order to design his own schedule.
The legal action is delayed for now, but because the Cooper Lane house would be worth a sizable amount on the open market — probably a great deal more than Stolmeier owes — it makes more financial sense for the lender to foreclose than to accept an unfavorable change in payment terms.
A sizable amount of on-demand music streaming is coming from paid subscription services like Spotify and Apple Music than can charge $9.99 for unlimited access.
He points out that Dell has a sizable amount of cash on its balance sheet — $11 billion as of Nov. 2.
If sports fandom is a culture unto itself, then those who spend a sizable amount of time on message boards dedicated to their favorite teams are part of a subculture.
I have also spent a sizable amount of money on the newly discovered outtakes and rarities that must, by law, come to crowd out a dead star's back catalogue, and even - oh, the shame of it - stopped worrying about looking like an anorak and set up a website.
The defenders had a sizable amount of armour on hand in local reserve and used these to launch counterattacks.
That was the acquisition that launched the Turner company as a major advertising player in the South, and it involved taking on a sizable amount of debt.
However, this finding was based on half the sample size (n = 1,050) reflecting a sizable amount of missing data on chest circumferences in hospital records.
