IF the head is warped a new gasket may help. Oil leaking out doesn't mean the head is warped necessarily. The gasket may just have failed.
NB If you get the engine dismantled enough to fit a new gasket, you may as well get the head checked/skimmed/re-faced at the same time. The main cost of this job will be the labour charge to get the head off in the first place, not the cost of the gasket or the price of the head repair.
If it's just leaking oil, and the coolant level isn't dropping every day, I would just remove the rocker cover and re-torque the cylinder head - it probably won't help tbh but it doesn't cost anything and is easy enough to do.
Alternatively depending how much oil you're losing, just keep degreasing the engine... or
If your car is old, you can get some stop-leak products you put in the oil and it makes gaskets swell up a bit, which may help stop a leak or make it less serious, but it's not a repair as such...or
If you can find a good used engine it may be cheaper to swap it for yours. Except you won't know if it's any good or not so a bit of a gamble.