Is it possible to buy sill paint tester pots?

[StandardLampski]

Sorry if I'm being thick but can't seem to see an answer anywhere! Most tester pots I've found are matt, or don't indicate.

I would normally go Matt but - it's a kids room, it is currently painted in silk from previous tenants, and I'm scared of putting Matt over it, and I only want to do a few splashes of colour.
Thank you if you have any idea!

[MumOnTheRunCatchingUp]

Valspar make up silk testers ( B&Q)

Any colour you like for £2.58

[StandardLampski]

Thank you!