Since I don't have any Gladiator statistics, I'll make my suggestion based on Marketplace.tf sales and the median key price of the day it was bought, that's 15 sales within a range of 3 months.

Sale 1 - 09/12/23

1 sold for 99.99 USD, median key price of that day 2.03 USD ~49.3 keys

Sale 2 - 10/02/23

1 sold for 119.99 USD, median key price of that day 2.05 USD ~58.5 keys

Sale 3 - 10/10/23

1 sold for 119.99 USD, median key price of that day 2.02 USD ~59.4 keys

Sale 4 - 10/14/23

1 sold for 119.99 USD, median key price of that day 2.03 USD ~59.1 keys

Sale 5 - 10/25/23

1 sold for 119.99 USD, median key price of that day 1.87 USD ~64.1 keys

Sale 6 - 10/29/23

1 sold for 119.99 USD, median key price of that day 1.84 USD ~65.2 keys

Sales 7 and 8 - 11/20/23

2 sold for 119.99 USD, median key price of that day 1.71 USD ~70.2 keys

Sales 9 and 10 - 11/21/23

2 sold for 119.99 USD, median key price of that day 1.71 USD ~70.2 keys

Sales 11 and 12 - 11/24/23

2 sold for 119.99 USD, median key price of that day 1.71 USD ~70.2 keys

Sale 13 - 11/27/23

1 sold for 119.99 USD, median key price of that day 1.71 USD ~70.2 keys

Sales 14 and 15 - 12/01/23

2 sold for 119.99 USD, median key price of that day 1.72 USD ~69.8 keys

New price suggestion

I'm considering sale 1 as an outlier since the current quickbuy listings orders are above 52 keys. So I'm taking a low value of 59 and high value of 70 keys.