too expensive just for 2 nights
I'd look at it the other way tbh. For staying 30 nights, I would totally get why someone would say it is too expensive. But as you are in a private house for most of it and only staying 2 nights, is that not a perfect chance to treat yourself?
I'd understand someone saying "it's too expensive - period" - in which case Mirage is $178+RF+tax, TI Marky gave you or as a wildcard, Trump is available for £57.50/night incl tax but not including RF.
Harrahs can be had for $60 + tax + RF on a code also.