Find one the way I do:
At Digikey.com, search for
n-channel mosfet
in-stock
FETS - single
start filtering:
logic-level gate
package style (thru hole? surface mount?)
Now sort by price
Start scrolling down to single-part prices that are in stock.
Look for a part with low Rds, low gate capacitance.
This is the first one I see has low Rds, low gate capacitance, and low price: