The penguino comes up a lot as a recommendation

I haven't picked one yet, but enough BTU to cover the bedroom and the lowest decibel possible will be my two qualifiers

A small unit to keep the bedroom cool at night is a good option.

If you can, you should hold off and purchase in late Autumn or Winter when the prices have come down. That'll allow you to buy a better unit for the same or less money. You're currently in the "catching an uber from the grand final" surge pricing of aircon

portable split air conditioner

I have a very slightly used one for cheap if your in the central Texas area.