Suggestion: Frostbite Tartan Spartan at 61–93 keys

(if you look into history of keys, you can see that 145 keys acquired have Ghastly and Ender exchanging, while 135 removed that Ender exchanged to RTHR)

https://backpack.tf/profiles/76561198188093413#!/compare/1615161600/1615248000 (only see part of the keys exchanged but you can see

the birdcage leaving to Ender)

https://backpack.tf/profiles/76561198037484203#!/compare/1615075200/1615248000 (can see some of the keys leaving to Ender for the birdcage)

Full explanation can be seen here - https://backpack.tf/suggestion/60bd222e35865718e37d60d6

Taking average of 140 keys

Spartan + 47.5 = 140

140 - 47.5 = ~93 keys

Therefore, new price range of 61 - 93 keys

In the birdcage scenario, the best solution is to take it at 135. Ender's purchase is basically just a middleman action, the 10 keys are pretty much fees to him for middlemanning the trade. Another way to see it is that the buyer paid 145 on a buyout of 135 (which is essentially what happened), thus capping the sale at 135, as there is a clear reason for paying more than the buyout. In this case it does not really matter as the difference is very small, but something to keep in mind for future reference.