The 2N7002 or 2N7002K MOSFET is one of the best MOSFETs to use if you just want to have a general purpose switching FET.
- 60Vds
- 300mA
- 1.9Ohm RDSon
It or its variants is available from many manufacturers and at all distributors.
On LCSC, for example, one reel of 2N7002 from chinese manufacturer HL, only costs 15.90€, that is 0,0053€/pc